[Docs] [txt|pdf|xml] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits]

Versions: (draft-perreault-opsawg-natmib-bis) 00 01 02 03 05 06 07 08 09 10 11 draft-perrault-behave-deprecate-nat-mib-v1

Network Working Group                                       S. Perreault
Internet-Draft                                                  Viagenie
Obsoletes: 4008 (if approved)                                    T. Tsou
Intended status: Standards Track               Huawei Technologies (USA)
Expires: March 31, 2014                                     S. Sivakumar
                                                           Cisco Systems
                                                      September 27, 2013


  Definitions of Managed Objects for Network Address Translators (NAT)
                      draft-ietf-behave-nat-mib-08

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for devices implementing Network Address Translator (NAT) function.
   This MIB module may be used for monitoring of a device capable of NAT
   function.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 31, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of



Perreault, et al.        Expires March 31, 2014                 [Page 1]


Internet-Draft                   NAT MIB                  September 2013


   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Internet-Standard Management Framework  . . . . . . . . .   2
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Deprecated Features . . . . . . . . . . . . . . . . . . .   3
     3.2.  New Features  . . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  Realms  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  77
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  80
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  80
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  80
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  81
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  82

1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for devices implementing NAT function.  This MIB module may be used
   for monitoring of a device capable of NAT function.  Using it for
   configuration is deprecated.  NAT types and their characteristics are
   defined in [RFC2663].  Traditional NAT function, in particular is
   defined in [RFC3022].  This MIB does not address the firewall
   functions and must not be used for configuring or monitoring these.
   Section 2 provides references to the SNMP management framework, which
   was used as the basis for the MIB module definition.  Section 3
   provides an overview of the MIB features.  Lastly, Section 4 has the
   complete NAT MIB definition.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

2.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB



Perreault, et al.        Expires March 31, 2014                 [Page 2]


Internet-Draft                   NAT MIB                  September 2013


   module that is compliant to the SMIv2, which is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

3.  Overview

3.1.  Deprecated Features

   All objects defined in [RFC4008] have been marked with "STATUS
   deprecated" for the following reasons:

   Writability:  Experience with NAT has shown that implementations vary
      tremendously.  The NAT algorithms and data structures have little
      in common across devices, and this results in wildly incompatible
      configuration parameters.  Therefore, few implementations were
      ever able to claim full compliance.

      Lesson learned: the MIB should be read-only as much as possible.

   Exposing configuration parameters:  Even in read-only mode, many
      configuration parameters were exposed by [RFC4008] (e.g.
      timeouts).  Since implementations vary wildly in their sets of
      configuration parameters, few implementations could claim even
      basic compliance.

      Lesson learned: the NAT MIB's purpose is not to expose
      configuration parameters.

   Interfaces:  Objects from [RFC4008] tie NAT state with interfaces
      (e.g. the interface table, the way map entries are grouped by
      interface).  Many NAT implementations either never keep track of
      the interface or associate a mapping to a set of interfaces.
      Since interfaces are at the core of [RFC4008], many NAT devices
      were unable to have a proper implementation.

      Lesson learned: NAT is a logical function that may be independent
      of interfaces.  Do not tie NAT state with interfaces.

   NAT service types:  [RFC4008] used four categories of NAT service:
      basicNat, napt, bidirectionalNat, twiceNat.  These are ill-defined
      and many implementations either use different categories or do not
      use categories at all.

      Lesson learned: do not try to categorize NAT types.

   Limited transport protocol set:  The set of transport protocols was
      defined as: other, icmp, udp, tcp.  Furthermore, the numeric
      values corresponding to those labels were arbitrary, without



Perreault, et al.        Expires March 31, 2014                 [Page 3]


Internet-Draft                   NAT MIB                  September 2013


      relation to the actual standard protocol numbers.  This meant that
      NAT implementations were limited to those protocols and were
      unable to expose information about DCCP, SCTP, etc.

      Lesson learned: use standard transport protocol numbers.

3.2.  New Features

   New features in this module are as follows:

   Counters:  Many new counters are introduced.  Most of them are
      available in two variants: global and per-transport protocol.

   Limits:  A few limits on the quantity of state data stored by the NAT
      device.  Some of them can trigger notifications.

   Address+Port Pools:  Pools of external addresses and ports are often
      used in enterprise and ISP settings.  Pools are listed in a table,
      each with its range of addresses and ports.  It is possible to
      inspect each pool's usage, to set limits, and to receive
      notifications when thresholds are crossed.

   Address Mappings:  NATs that have an "IP address pooling" behavior of
      "Paired" [RFC4787] maintain a mapping from internal address to
      external address.  This module allows inspection of this mapping
      table.

   Mapping table indexed by external 3-tuple:  It is often necessary to
      determine the internal address that is mapped to a given external
      address and port.  This MIB provides this table with an index to
      accomplish this efficiently, without having to iterate over all
      mappings.

   Realms:  See Section 3.3.

   RFC 4787 terminology:  Mapping table entries indicate the mapping
      behavior, the filtering behavior, and the address pooling behavior
      that were used to create the mapping.

   Subscriber awareness:  With the advent of CGN deployment, a set of
      subscriber specific counters, limits and parameters are added.

3.3.  Realms

   Current NAT devices commonly allow the internal and external parts of
   a mapping to come from different realms.  The meaning of "realm" is
   implementation-dependent.  On some implementations it can be
   equivalent to the name of a VPN Routing and Forwarding table (VRF).



Perreault, et al.        Expires March 31, 2014                 [Page 4]


Internet-Draft                   NAT MIB                  September 2013


   On others it is simply the numeric index of a virtual routing table.
   Note that this usage of "realm" is completely different from the one
   in [RFC4008].

   This MIB allows the realm to be indicated where it makes sense.  The
   format is an SnmpAdminString.  On platforms that identify realms with
   integers, the string representation of the integer is used instead.
   The empty string has special meaning: it refers to the default realm.

   Note that many MIBs implicitly support realms in one form or another
   by using SNMPv3 contexts.  See for example the OSPFv2 MIB [RFC4750].
   This method cannot be used for the NAT MIB because mapppings can
   belong to two realms simultaneously: the internal part can be in one
   realm while the external part is in another.  In such cases the NAT
   function acts like a "wormhole" between two realms.  Using contexts
   would implicitly impose the restriction that all objects would have
   to belong to the same realm.

4.  Definitions

   This MIB module IMPORTs objects from [RFC2578], [RFC2579], and
   [RFC4001].

   NAT-MIB DEFINITIONS ::= BEGIN

   IMPORTS
        MODULE-IDENTITY,
        OBJECT-TYPE,
        Integer32,
        Unsigned32,
        Gauge32,
        Counter64,
        TimeTicks,
        mib-2,
        NOTIFICATION-TYPE
                FROM SNMPv2-SMI
        TEXTUAL-CONVENTION,
        StorageType,
        RowStatus
                FROM SNMPv2-TC
        MODULE-COMPLIANCE,
        NOTIFICATION-GROUP,
        OBJECT-GROUP
                FROM SNMPv2-CONF
        ifIndex,
        ifCounterDiscontinuityGroup
                FROM IF-MIB
        SnmpAdminString



Perreault, et al.        Expires March 31, 2014                 [Page 5]


Internet-Draft                   NAT MIB                  September 2013


                FROM SNMP-FRAMEWORK-MIB
        InetAddressType,
        InetAddress,
        InetAddressPrefixLength,
        InetPortNumber
                FROM INET-ADDRESS-MIB;

   natMIB MODULE-IDENTITY
        LAST-UPDATED "201304260000Z"
   -- RFC Ed.: set to publication date
        ORGANIZATION
                "IETF Behavior Engineering for Hindrance Avoidance
                 (BEHAVE) Working Group"
        CONTACT-INFO
                "Working Group Email: behave@ietf.org

                 Simon Perreault
                 Viagenie
                 246 Aberdeen
                 Quebec, QC  G1R 2E1
                 Canada

                 Phone: +1 418 656 9254
                 Email: simon.perreault@viagenie.ca
                 URI:   http://viagenie.ca


                 Tina Tsou
                 Huawei Technologies (USA)
                 2330 Central Expressway
                 Santa Clara, CA  95050
                 USA

                 Phone: +1 408 330 4424
                 Email: tina.tsou.zouting@huawei.com


                 Senthil Sivakumar
                 Cisco Systems
                 7100-8 Kit Creek Road
                 Research Triangle Park, North Carolina  27709
                 USA

                 Phone: +1 919 392 5158
                 Email: ssenthil@cisco.com"
        DESCRIPTION
                "This MIB module defines the generic managed objects
                 for NAT.



Perreault, et al.        Expires March 31, 2014                 [Page 6]


Internet-Draft                   NAT MIB                  September 2013


                 Copyright (C) The Internet Society (2013).  This
                 version of this MIB module is part of RFC yyyy; see
                 the RFC itself for full legal notices."
   -- RFC Ed.: replace yyyy with actual RFC number & remove this note"
        REVISION     "201304260000Z"
   -- RFC Ed.: set to publication date
        DESCRIPTION
                "Complete rewrite, published as RFC yyyy."
   -- RFC Ed.: replace yyyy with actual RFC number & set date"
        REVISION     "200503210000Z"  -- 21th March 2005
        DESCRIPTION
                "Initial version, published as RFC 4008."
        ::= { mib-2 123 }

   natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 }

   NatProtocolType ::= TEXTUAL-CONVENTION
          STATUS       deprecated
          DESCRIPTION
                  "A list of protocols that support the network
                   address translation.  Inclusion of the values is
                   not intended to imply that those protocols
                   need to be supported.  Any change in this
                   TEXTUAL-CONVENTION should also be reflected in
                   the definition of NatProtocolMap, which is a
                   BITS representation of this."
          SYNTAX   INTEGER {
                        none (1),  -- not specified
                        other (2), -- none of the following
                        icmp (3),
                        udp (4),
                        tcp (5)
                     }

   NatProtocolMap ::= TEXTUAL-CONVENTION
          STATUS       deprecated
          DESCRIPTION
                  "A bitmap of protocol identifiers that support
                   the network address translation.  Any change
                   in this TEXTUAL-CONVENTION should also be
                   reflected in the definition of NatProtocolType."
          SYNTAX   BITS {
                     other (0),
                     icmp (1),
                     udp (2),
                     tcp (3)
                   }




Perreault, et al.        Expires March 31, 2014                 [Page 7]


Internet-Draft                   NAT MIB                  September 2013


   NatAddrMapId ::= TEXTUAL-CONVENTION
          DISPLAY-HINT "d"
          STATUS deprecated
          DESCRIPTION
                  "A unique id that is assigned to each address map
                   by a NAT enabled device."
          SYNTAX   Unsigned32 (1..4294967295)

   NatBindIdOrZero ::= TEXTUAL-CONVENTION
          DISPLAY-HINT "d"
          STATUS deprecated
          DESCRIPTION
                  "A unique id that is assigned to each bind by
                   a NAT enabled device.  The bind id will be zero
                   in the case of a Symmetric NAT."
          SYNTAX   Unsigned32 (0..4294967295)

   NatBindId ::= TEXTUAL-CONVENTION
          DISPLAY-HINT "d"
          STATUS deprecated
          DESCRIPTION
                  "A unique id that is assigned to each bind by
                   a NAT enabled device."
          SYNTAX   Unsigned32 (1..4294967295)

   NatSessionId ::= TEXTUAL-CONVENTION
          DISPLAY-HINT "d"
          STATUS deprecated
          DESCRIPTION
                  "A unique id that is assigned to each session by
                   a NAT enabled device."
          SYNTAX   Unsigned32 (1..4294967295)

   NatBindMode ::= TEXTUAL-CONVENTION
          STATUS deprecated
          DESCRIPTION
                  "An indication of whether the bind is
                   an address bind or an address port bind."
          SYNTAX   INTEGER {
                        addressBind (1),
                        addressPortBind (2)
                   }

   NatAssociationType ::= TEXTUAL-CONVENTION
          STATUS deprecated
          DESCRIPTION
                  "An indication of whether the association is
                   static or dynamic."



Perreault, et al.        Expires March 31, 2014                 [Page 8]


Internet-Draft                   NAT MIB                  September 2013


          SYNTAX   INTEGER {
                        static (1),
                        dynamic (2)
                   }

   NatTranslationEntity ::= TEXTUAL-CONVENTION
          STATUS       deprecated
          DESCRIPTION
                  "An indication of a) the direction of a session for
                   which an address map entry, address bind or port
                   bind is applicable, and b) the entity (source or
                   destination) within the session that is subject to
                   translation."
          SYNTAX   BITS {
                     inboundSrcEndPoint (0),
                     outboundDstEndPoint(1),
                     inboundDstEndPoint (2),
                     outboundSrcEndPoint(3)
                   }


   --
   -- Default Values for the Bind and NAT Protocol Timers
   --

   natDefTimeouts OBJECT IDENTIFIER ::= { natMIBObjects 1 }

   natNotifCtrl OBJECT IDENTIFIER ::= { natMIBObjects 2 }

   --
   -- Address Bind and Port Bind related NAT configuration
   --

   natBindDefIdleTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (0..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION
               "The default Bind (Address Bind or Port Bind) idle
                timeout parameter.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 0 }
       ::= { natDefTimeouts 1 }



Perreault, et al.        Expires March 31, 2014                 [Page 9]


Internet-Draft                   NAT MIB                  September 2013


   --
   -- UDP related NAT configuration
   --

   natUdpDefIdleTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (1..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION
               "The default UDP idle timeout parameter.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 300 }
       ::= { natDefTimeouts 2 }

   --
   -- ICMP related NAT configuration
   --

   natIcmpDefIdleTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (1..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION
               "The default ICMP idle timeout parameter.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 300 }
       ::= { natDefTimeouts 3 }

   --
   -- Other protocol parameters
   --

   natOtherDefIdleTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (1..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 10]


Internet-Draft                   NAT MIB                  September 2013


               "The default idle timeout parameter for protocols
                represented by the value other (2) in
                NatProtocolType.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 60 }
       ::= { natDefTimeouts 4 }

   --
   -- TCP related NAT Timers
   --

   natTcpDefIdleTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (1..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION
               "The default time interval that a NAT session for an
                established TCP connection is allowed to remain
                valid without any activity on the TCP connection.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 86400 }
       ::= { natDefTimeouts 5 }

   natTcpDefNegTimeout OBJECT-TYPE
       SYNTAX     Unsigned32  (1..4294967295)
       UNITS      "seconds"
       MAX-ACCESS read-write
       STATUS     deprecated
       DESCRIPTION
               "The default time interval that a NAT session for a TCP
                connection that is not in the established state
                is allowed to remain valid without any activity on
                the TCP connection.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system."
       DEFVAL { 60 }



Perreault, et al.        Expires March 31, 2014                [Page 11]


Internet-Draft                   NAT MIB                  September 2013


       ::= { natDefTimeouts 6 }

   natNotifThrottlingInterval OBJECT-TYPE
       SYNTAX      Integer32 (0 | 5..3600)
       UNITS       "seconds"
       MAX-ACCESS  read-write
       STATUS      deprecated
       DESCRIPTION
               "This object controls the generation of the
                natPacketDiscard notification.

                If this object has a value of zero, then no
                natPacketDiscard notifications will be transmitted by
                the agent.

                If this object has a non-zero value, then the agent must
                not generate more than one natPacketDiscard
                'notification-event' in the indicated period, where a
                'notification-event' is the generation of a single
                notification PDU type to a list of notification
                destinations.  If additional NAT packets are discarded
                within the throttling period, then notification-events
                for these changes must be suppressed by the agent until
                the current throttling period expires.

                If natNotifThrottlingInterval notification generation
                is enabled, the suggested default throttling period is
                60 seconds, but generation of the natPacketDiscard
                notification should be disabled by default.

                If the agent is capable of storing non-volatile
                configuration, then the value of this object must be
                restored after a re-initialization of the management
                system.

                The actual transmission of notifications is controlled
                via the MIB modules in RFC 3413."
       DEFVAL { 0 }
       ::= { natNotifCtrl 1 }


   --
   -- The NAT Interface Table
   --

   natInterfaceTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF NatInterfaceEntry
       MAX-ACCESS  not-accessible



Perreault, et al.        Expires March 31, 2014                [Page 12]


Internet-Draft                   NAT MIB                  September 2013


       STATUS      deprecated
       DESCRIPTION
               "This table specifies the attributes for interfaces on a
                device supporting NAT function."
       ::= { natMIBObjects 3 }

   natInterfaceEntry OBJECT-TYPE
       SYNTAX      NatInterfaceEntry
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "Each entry in the natInterfaceTable holds a set of
                parameters for an interface, instantiated by
                ifIndex.  Therefore, the interface index must have been
                assigned, according to the applicable procedures,
                before it can be meaningfully used.
                Generally, this means that the interface must exist.

                When natStorageType is of type nonVolatile, however,
                this may reflect the configuration for an interface
                whose ifIndex has been assigned but for which the
                supporting implementation is not currently present."
       INDEX   { ifIndex }
       ::= { natInterfaceTable 1 }

   NatInterfaceEntry ::= SEQUENCE {
       natInterfaceRealm            INTEGER,
       natInterfaceServiceType      BITS,
       natInterfaceInTranslates     Counter64,
       natInterfaceOutTranslates    Counter64,
       natInterfaceDiscards         Counter64,
       natInterfaceStorageType      StorageType,
       natInterfaceRowStatus        RowStatus
   }

   natInterfaceRealm OBJECT-TYPE
       SYNTAX     INTEGER {
                      private (1),
                      public (2)
                  }
       MAX-ACCESS read-create
       STATUS     deprecated
       DESCRIPTION
               "This object identifies whether this interface is
                connected to the private or the public realm."
       DEFVAL  { public }
       ::= { natInterfaceEntry 1 }




Perreault, et al.        Expires March 31, 2014                [Page 13]


Internet-Draft                   NAT MIB                  September 2013


   natInterfaceServiceType OBJECT-TYPE
       SYNTAX  BITS {
                   basicNat (0),
                   napt (1),
                   bidirectionalNat (2),
                   twiceNat (3)
               }
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "An indication of the direction in which new sessions
                are permitted and the extent of translation done within
                the IP and transport headers."
       ::= { natInterfaceEntry 2 }

   natInterfaceInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "Number of packets received on this interface that
                were translated.
                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natInterfaceEntry 3 }

   natInterfaceOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "Number of translated packets that were sent out this
                interface.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natInterfaceEntry 4 }

   natInterfaceDiscards OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "Number of packets that had to be rejected/dropped due to



Perreault, et al.        Expires March 31, 2014                [Page 14]


Internet-Draft                   NAT MIB                  September 2013


                a lack of resources for this interface.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
        ::= { natInterfaceEntry 5 }

   natInterfaceStorageType OBJECT-TYPE
       SYNTAX      StorageType
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "The storage type for this conceptual row.
                Conceptual rows having the value 'permanent'
                need not allow write-access to any columnar objects
                in the row."
       REFERENCE
               "Textual Conventions for SMIv2, Section 2."
       DEFVAL { nonVolatile }
       ::= { natInterfaceEntry 6 }

   natInterfaceRowStatus OBJECT-TYPE
       SYNTAX      RowStatus
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "The status of this conceptual row.

                Until instances of all corresponding columns are
                appropriately configured, the value of the
                corresponding instance of the natInterfaceRowStatus
                column is 'notReady'.


                In particular, a newly created row cannot be made
                active until the corresponding instance of
                natInterfaceServiceType has been set.

                None of the objects in this row may be modified
                while the value of this object is active(1)."
       REFERENCE
               "Textual Conventions for SMIv2, Section 2."
       ::= { natInterfaceEntry 7 }

   --
   -- The Address Map Table
   --



Perreault, et al.        Expires March 31, 2014                [Page 15]


Internet-Draft                   NAT MIB                  September 2013


   natAddrMapTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF NatAddrMapEntry
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This table lists address map parameters for NAT."
       ::= { natMIBObjects 4 }

   natAddrMapEntry OBJECT-TYPE
       SYNTAX      NatAddrMapEntry
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This entry represents an address map to be used for
                NAT and contributes to the dynamic and/or static
                address mapping tables of the NAT device."
       INDEX   { ifIndex, natAddrMapIndex }
       ::= { natAddrMapTable 1 }

   NatAddrMapEntry ::= SEQUENCE {
       natAddrMapIndex                 NatAddrMapId,
       natAddrMapName                  SnmpAdminString,
       natAddrMapEntryType             NatAssociationType,
       natAddrMapTranslationEntity     NatTranslationEntity,
       natAddrMapLocalAddrType         InetAddressType,
       natAddrMapLocalAddrFrom         InetAddress,
       natAddrMapLocalAddrTo           InetAddress,
       natAddrMapLocalPortFrom         InetPortNumber,
       natAddrMapLocalPortTo           InetPortNumber,
       natAddrMapGlobalAddrType        InetAddressType,
       natAddrMapGlobalAddrFrom        InetAddress,
       natAddrMapGlobalAddrTo          InetAddress,
       natAddrMapGlobalPortFrom        InetPortNumber,
       natAddrMapGlobalPortTo          InetPortNumber,
       natAddrMapProtocol              NatProtocolMap,
       natAddrMapInTranslates          Counter64,
       natAddrMapOutTranslates         Counter64,
       natAddrMapDiscards              Counter64,
       natAddrMapAddrUsed              Gauge32,
       natAddrMapStorageType           StorageType,
       natAddrMapRowStatus             RowStatus
   }

   natAddrMapIndex  OBJECT-TYPE
       SYNTAX      NatAddrMapId
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 16]


Internet-Draft                   NAT MIB                  September 2013


               "Along with ifIndex, this object uniquely
                identifies an entry in the natAddrMapTable.
                Address map entries are applied in the order
                specified by natAddrMapIndex."
       ::= { natAddrMapEntry 1 }

   natAddrMapName OBJECT-TYPE
       SYNTAX      SnmpAdminString (SIZE(1..32))
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "Name identifying all map entries in the table associated
                with the same interface.  All map entries with the same
                ifIndex MUST have the same map name."
       ::= { natAddrMapEntry 2 }

   natAddrMapEntryType OBJECT-TYPE
       SYNTAX      NatAssociationType
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This parameter can be used to set up static
                or dynamic address maps."
       ::= { natAddrMapEntry 3 }

   natAddrMapTranslationEntity OBJECT-TYPE
       SYNTAX      NatTranslationEntity
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "The end-point entity (source or destination) in
                inbound or outbound sessions (i.e., first packets) that
                may be translated by an address map entry.

                Session direction (inbound or outbound) is
                derived from the direction of the first packet
                of a session traversing a NAT interface.
                NAT address (and Transport-ID) maps may be defined
                to effect inbound or outbound sessions.

                Traditionally, address maps for Basic NAT and NAPT are
                configured on a public interface for outbound sessions,
                effecting translation of source end-point.  The value of
                this object must be set to outboundSrcEndPoint for
                those interfaces.

                Alternately, if address maps for Basic NAT and NAPT were
                to be configured on a private interface, the desired



Perreault, et al.        Expires March 31, 2014                [Page 17]


Internet-Draft                   NAT MIB                  September 2013


                value for this object for the map entries
                would be inboundSrcEndPoint (i.e., effecting translation
                of source end-point for inbound sessions).

                If TwiceNAT were to be configured on a private
                interface, the desired value for this object for the map
                entries would be a bitmask of inboundSrcEndPoint and
                inboundDstEndPoint."
       ::= { natAddrMapEntry 4 }

   natAddrMapLocalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo."
       ::= { natAddrMapEntry 5 }

   natAddrMapLocalAddrFrom OBJECT-TYPE
       SYNTAX      InetAddress
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the first IP address of the range
                of IP addresses mapped by this translation entry.  The
                value of this object must be less than or equal to the
                value of the natAddrMapLocalAddrTo object.

                The type of this address is determined by the value of
                the natAddrMapLocalAddrType object."
       ::= { natAddrMapEntry 6 }

   natAddrMapLocalAddrTo OBJECT-TYPE
       SYNTAX      InetAddress
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the last IP address of the range
                of IP addresses mapped by this translation entry.  If
                only a single address is being mapped, the value of this
                object is equal to the value of natAddrMapLocalAddrFrom.
                For a static NAT, the number of addresses in the range
                defined by natAddrMapLocalAddrFrom and
                natAddrMapLocalAddrTo must be equal to the number of
                addresses in the range defined by
                natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo.
                The value of this object must be greater than or equal



Perreault, et al.        Expires March 31, 2014                [Page 18]


Internet-Draft                   NAT MIB                  September 2013


                to the value of the natAddrMapLocalAddrFrom object.

                The type of this address is determined by the value of
                the natAddrMapLocalAddrType object."
       ::= { natAddrMapEntry 7 }

   natAddrMapLocalPortFrom OBJECT-TYPE
       SYNTAX      InetPortNumber
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "If this conceptual row describes a Basic NAT address
                mapping, then the value of this object must be zero.  If
                this conceptual row describes NAPT, then the value of
                this object specifies the first port number in the range
                of ports being mapped.

                The value of this object must be less than or equal to
                the value of the natAddrMapLocalPortTo object.  If the
                translation specifies a single port, then the value of
                this object is equal to the value of
                natAddrMapLocalPortTo."
       DEFVAL { 0 }
       ::= { natAddrMapEntry 8 }

   natAddrMapLocalPortTo OBJECT-TYPE
       SYNTAX      InetPortNumber
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "If this conceptual row describes a Basic NAT address
                mapping, then the value of this object must be zero.  If
                this conceptual row describes NAPT, then the value of
                this object specifies the last port number in the range
                of ports being mapped.

                The value of this object must be greater than or equal
                to the value of the natAddrMapLocalPortFrom object.  If
                the translation specifies a single port, then the value
                of this object is equal to the value of
                natAddrMapLocalPortFrom."
       DEFVAL { 0 }
       ::= { natAddrMapEntry 9 }

   natAddrMapGlobalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-create
       STATUS      deprecated



Perreault, et al.        Expires March 31, 2014                [Page 19]


Internet-Draft                   NAT MIB                  September 2013


       DESCRIPTION
               "This object specifies the address type used for
                natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo."
       ::= { natAddrMapEntry 10 }

   natAddrMapGlobalAddrFrom OBJECT-TYPE
       SYNTAX      InetAddress
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the first IP address of the range
                of IP addresses being mapped to.  The value of this
                object must be less than or equal to the value of the
                natAddrMapGlobalAddrTo object.

                The type of this address is determined by the value of
                the natAddrMapGlobalAddrType object."
       ::= { natAddrMapEntry 11 }

   natAddrMapGlobalAddrTo OBJECT-TYPE
       SYNTAX      InetAddress
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the last IP address of the range
                of IP addresses being mapped to.  If only a single
                address is being mapped to, the value of this object is
                equal to the value of natAddrMapGlobalAddrFrom.  For a
                static NAT, the number of addresses in the range defined
                by natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo
                must be equal to the number of addresses in the range
                defined by natAddrMapLocalAddrFrom and
                natAddrMapLocalAddrTo.  The value of this object must be
                greater than or equal to the value of the
                natAddrMapGlobalAddrFrom object.

                The type of this address is determined by the value of
                the natAddrMapGlobalAddrType object."
       ::= { natAddrMapEntry 12 }

   natAddrMapGlobalPortFrom OBJECT-TYPE
       SYNTAX      InetPortNumber
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "If this conceptual row describes a Basic NAT address
                mapping, then the value of this object must be zero.  If
                this conceptual row describes NAPT, then the value of



Perreault, et al.        Expires March 31, 2014                [Page 20]


Internet-Draft                   NAT MIB                  September 2013


                this object specifies the first port number in the range
                of ports being mapped to.


                The value of this object must be less than or equal to
                the value of the natAddrMapGlobalPortTo object.  If the
                translation specifies a single port, then the value of
                this object is equal to the value
                natAddrMapGlobalPortTo."
       DEFVAL { 0 }
       ::= { natAddrMapEntry 13 }

   natAddrMapGlobalPortTo OBJECT-TYPE
       SYNTAX      InetPortNumber
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "If this conceptual row describes a Basic NAT address
                mapping, then the value of this object must be zero.  If
                this conceptual row describes NAPT, then the value of
                this object specifies the last port number in the range
                of ports being mapped to.

                The value of this object must be greater than or equal
                to the value of the natAddrMapGlobalPortFrom object.  If
                the translation specifies a single port, then the value
                of this object is equal to the value of
                natAddrMapGlobalPortFrom."
       DEFVAL { 0 }
       ::= { natAddrMapEntry 14 }

   natAddrMapProtocol OBJECT-TYPE
       SYNTAX      NatProtocolMap
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "This object specifies a bitmap of protocol identifiers."
       ::= { natAddrMapEntry 15 }

   natAddrMapInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of inbound packets pertaining to this address
                map entry that were translated.

                Discontinuities in the value of this counter can occur



Perreault, et al.        Expires March 31, 2014                [Page 21]


Internet-Draft                   NAT MIB                  September 2013


                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrMapEntry 16 }

   natAddrMapOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of outbound packets pertaining to this
                address map entry that were translated.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrMapEntry 17 }

   natAddrMapDiscards OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of packets pertaining to this address map
                entry that were dropped due to lack of addresses in the
                address pool identified by this address map.  The value
                of this object must always be zero in case of static
                address map.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrMapEntry 18 }

   natAddrMapAddrUsed OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of addresses pertaining to this address map
                that are currently being used from the NAT pool.
                The value of this object must always be zero in the case
                of a static address map."
       ::= { natAddrMapEntry 19 }

   natAddrMapStorageType OBJECT-TYPE



Perreault, et al.        Expires March 31, 2014                [Page 22]


Internet-Draft                   NAT MIB                  September 2013


       SYNTAX      StorageType
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "The storage type for this conceptual row.
                Conceptual rows having the value 'permanent'
                need not allow write-access to any columnar objects
                in the row."
       REFERENCE
               "Textual Conventions for SMIv2, Section 2."
       DEFVAL { nonVolatile }
       ::= { natAddrMapEntry 20 }

   natAddrMapRowStatus OBJECT-TYPE
       SYNTAX      RowStatus
       MAX-ACCESS  read-create
       STATUS      deprecated
       DESCRIPTION
               "The status of this conceptual row.

                Until instances of all corresponding columns are
                appropriately configured, the value of the
                corresponding instance of the natAddrMapRowStatus
                column is 'notReady'.

                None of the objects in this row may be modified
                while the value of this object is active(1)."
       REFERENCE
               "Textual Conventions for SMIv2, Section 2."
       ::= { natAddrMapEntry 21 }

   --
   -- Address Bind section
   --

   natAddrBindNumberOfEntries OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object maintains a count of the number of entries
                that currently exist in the natAddrBindTable."
       ::= { natMIBObjects 5 }

   --
   -- The NAT Address BIND Table
   --




Perreault, et al.        Expires March 31, 2014                [Page 23]


Internet-Draft                   NAT MIB                  September 2013


   natAddrBindTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF NatAddrBindEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "This table holds information about the currently
                active NAT BINDs."
       ::= { natMIBObjects 6 }

   natAddrBindEntry OBJECT-TYPE
       SYNTAX     NatAddrBindEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "Each entry in this table holds information about
                an active address BIND.  These entries are lost
                upon agent restart.

                This row has indexing which may create variables with
                more than 128 subidentifiers.  Implementers of this
                table must be careful not to create entries that would
                result in OIDs which exceed the 128 subidentifier limit.
                Otherwise, the information cannot be accessed using
                SNMPv1, SNMPv2c or SNMPv3."

       INDEX   { ifIndex,
                 natAddrBindLocalAddrType,
                 natAddrBindLocalAddr }
       ::= { natAddrBindTable 1 }

   NatAddrBindEntry ::= SEQUENCE {
       natAddrBindLocalAddrType        InetAddressType,
       natAddrBindLocalAddr            InetAddress,
       natAddrBindGlobalAddrType       InetAddressType,
       natAddrBindGlobalAddr           InetAddress,
       natAddrBindId                   NatBindId,
       natAddrBindTranslationEntity    NatTranslationEntity,
       natAddrBindType                 NatAssociationType,
       natAddrBindMapIndex             NatAddrMapId,
       natAddrBindSessions             Gauge32,
       natAddrBindMaxIdleTime          TimeTicks,
       natAddrBindCurrentIdleTime      TimeTicks,
       natAddrBindInTranslates         Counter64,
       natAddrBindOutTranslates        Counter64
   }

   natAddrBindLocalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType



Perreault, et al.        Expires March 31, 2014                [Page 24]


Internet-Draft                   NAT MIB                  September 2013


       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natAddrBindLocalAddr."
       ::= { natAddrBindEntry 1 }

   natAddrBindLocalAddr OBJECT-TYPE
       SYNTAX     InetAddress (SIZE (4|16))
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "This object represents the private-realm specific
                network layer address, which maps to the public-realm
                address represented by natAddrBindGlobalAddr.

                The type of this address is determined by the value of
                the natAddrBindLocalAddrType object."
      ::= { natAddrBindEntry 2 }

   natAddrBindGlobalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natAddrBindGlobalAddr."
       ::= { natAddrBindEntry 3 }

   natAddrBindGlobalAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents the public-realm network layer
                address that maps to the private-realm network layer
                address represented by natAddrBindLocalAddr.

                The type of this address is determined by the value of
                the natAddrBindGlobalAddrType object."
       ::= { natAddrBindEntry 4 }

   natAddrBindId OBJECT-TYPE
       SYNTAX     NatBindId
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents a bind id that is dynamically



Perreault, et al.        Expires March 31, 2014                [Page 25]


Internet-Draft                   NAT MIB                  September 2013


                assigned to each bind by a NAT enabled device.  Each
                bind is represented by a bind id that is
                unique across both, the natAddrBindTable and the
                natAddrPortBindTable."
       ::= { natAddrBindEntry 5 }

   natAddrBindTranslationEntity OBJECT-TYPE
       SYNTAX     NatTranslationEntity
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents the direction of sessions
                for which this bind is applicable and the endpoint
                entity (source or destination) within the sessions that
                is subject to translation using the BIND.

                Orientation of the bind can be a superset of
                translationEntity of the address map entry which
                forms the basis for this bind.

                For example, if the translationEntity of an
                address map entry is outboundSrcEndPoint, the
                translationEntity of a bind derived from this
                map entry may either be outboundSrcEndPoint or
                it may be bidirectional (a bitmask of
                outboundSrcEndPoint and inboundDstEndPoint)."
       ::= { natAddrBindEntry 6 }

   natAddrBindType OBJECT-TYPE
       SYNTAX     NatAssociationType
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object indicates whether the bind is static or
                dynamic."
       ::= { natAddrBindEntry 7 }

   natAddrBindMapIndex OBJECT-TYPE
       SYNTAX     NatAddrMapId
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object is a pointer to the natAddrMapTable entry
                (and the parameters of that entry) which was used in
                creating this BIND.  This object, in conjunction with
                the ifIndex (which identifies a unique addrMapName)
                points to a unique entry in the natAddrMapTable."
       ::= { natAddrBindEntry 8 }



Perreault, et al.        Expires March 31, 2014                [Page 26]


Internet-Draft                   NAT MIB                  September 2013


   natAddrBindSessions OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "Number of sessions currently using this BIND."
       ::= { natAddrBindEntry 9 }

   natAddrBindMaxIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object indicates the maximum time for
                which this bind can be idle with no sessions
                attached to it.

                The value of this object is of relevance only for
                dynamic NAT."
       ::= { natAddrBindEntry 10 }

   natAddrBindCurrentIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "At any given instance, this object indicates the
                time that this bind has been idle without any sessions
                attached to it.

                The value of this object is of relevance only for
                dynamic NAT."
       ::= { natAddrBindEntry 11 }

   natAddrBindInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of inbound packets that were successfully
                translated by using this bind entry.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrBindEntry 12 }




Perreault, et al.        Expires March 31, 2014                [Page 27]


Internet-Draft                   NAT MIB                  September 2013


   natAddrBindOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of outbound packets that were successfully
                translated using this bind entry.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrBindEntry 13 }

   --
   -- Address Port Bind section
   --

   natAddrPortBindNumberOfEntries OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object maintains a count of the number of entries
                that currently exist in the natAddrPortBindTable."
       ::= { natMIBObjects 7 }

   --
   -- The NAT Address Port Bind Table
   --

   natAddrPortBindTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF NatAddrPortBindEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "This table holds information about the currently
                active NAPT BINDs."
       ::= { natMIBObjects 8 }

   natAddrPortBindEntry OBJECT-TYPE
       SYNTAX     NatAddrPortBindEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "Each entry in the this table holds information
                about a NAPT bind that is currently active.
                These entries are lost upon agent restart.



Perreault, et al.        Expires March 31, 2014                [Page 28]


Internet-Draft                   NAT MIB                  September 2013


                This row has indexing which may create variables with
                more than 128 subidentifiers.  Implementers of this
                table must be careful not to create entries which would
                result in OIDs that exceed the 128 subidentifier limit.
                Otherwise, the information cannot be accessed using
                SNMPv1, SNMPv2c or SNMPv3."
       INDEX   { ifIndex, natAddrPortBindLocalAddrType,
                 natAddrPortBindLocalAddr, natAddrPortBindLocalPort,
                 natAddrPortBindProtocol }
       ::= { natAddrPortBindTable 1 }

   NatAddrPortBindEntry ::= SEQUENCE {
       natAddrPortBindLocalAddrType        InetAddressType,
       natAddrPortBindLocalAddr            InetAddress,
       natAddrPortBindLocalPort            InetPortNumber,
       natAddrPortBindProtocol             NatProtocolType,
       natAddrPortBindGlobalAddrType       InetAddressType,
       natAddrPortBindGlobalAddr           InetAddress,
       natAddrPortBindGlobalPort           InetPortNumber,
       natAddrPortBindId                   NatBindId,
       natAddrPortBindTranslationEntity    NatTranslationEntity,
       natAddrPortBindType                 NatAssociationType,
       natAddrPortBindMapIndex             NatAddrMapId,
       natAddrPortBindSessions             Gauge32,
       natAddrPortBindMaxIdleTime          TimeTicks,
       natAddrPortBindCurrentIdleTime      TimeTicks,
       natAddrPortBindInTranslates         Counter64,
       natAddrPortBindOutTranslates        Counter64
   }

   natAddrPortBindLocalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natAddrPortBindLocalAddr."
       ::= { natAddrPortBindEntry 1 }

   natAddrPortBindLocalAddr OBJECT-TYPE
       SYNTAX     InetAddress (SIZE(4|16))
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "This object represents the private-realm specific
                network layer address which, in conjunction with
                natAddrPortBindLocalPort, maps to the public-realm
                network layer address and transport id represented by



Perreault, et al.        Expires March 31, 2014                [Page 29]


Internet-Draft                   NAT MIB                  September 2013


                natAddrPortBindGlobalAddr and natAddrPortBindGlobalPort
                respectively.


                The type of this address is determined by the value of
                the natAddrPortBindLocalAddrType object."
       ::= { natAddrPortBindEntry 2 }

   natAddrPortBindLocalPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "For a protocol value TCP or UDP, this object represents
                the private-realm specific port number.  On the other
                hand, for ICMP a bind is created only for query/response
                type ICMP messages such as ICMP echo, Timestamp, and
                Information request messages, and this object represents
                the private-realm specific identifier in the ICMP
                message, as defined in RFC 792 for ICMPv4 and in RFC
                2463 for ICMPv6.

                This object, together with natAddrPortBindProtocol,
                natAddrPortBindLocalAddrType, and
                natAddrPortBindLocalAddr, constitutes a session endpoint
                in the private realm.  A bind entry binds a private
                realm specific endpoint to a public realm specific
                endpoint, as represented by the tuple of
                (natAddrPortBindGlobalPort, natAddrPortBindProtocol,
                natAddrPortBindGlobalAddrType, and
                natAddrPortBindGlobalAddr)."
      ::= { natAddrPortBindEntry 3 }

   natAddrPortBindProtocol OBJECT-TYPE
       SYNTAX      NatProtocolType
       MAX-ACCESS  not-accessible
       STATUS      deprecated
       DESCRIPTION
               "This object specifies a protocol identifier.  If the
                value of this object is none(1), then this bind entry
                applies to all IP traffic.  Any other value of this
                object specifies the class of IP traffic to which this
                BIND applies."
       ::= { natAddrPortBindEntry 4 }

   natAddrPortBindGlobalAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-only



Perreault, et al.        Expires March 31, 2014                [Page 30]


Internet-Draft                   NAT MIB                  September 2013


       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natAddrPortBindGlobalAddr."
       ::= { natAddrPortBindEntry 5 }

   natAddrPortBindGlobalAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents the public-realm specific network
                layer address that, in conjunction with
                natAddrPortBindGlobalPort, maps to the private-realm

                network layer address and transport id represented by
                natAddrPortBindLocalAddr and natAddrPortBindLocalPort,
                respectively.

                The type of this address is determined by the value of
                the natAddrPortBindGlobalAddrType object."
       ::= { natAddrPortBindEntry 6 }

   natAddrPortBindGlobalPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "For a protocol value TCP or UDP, this object represents
                the public-realm specific port number.  On the other
                hand, for ICMP a bind is created only for query/response
                type ICMP messages such as ICMP echo, Timestamp, and
                Information request messages, and this object represents
                the public-realm specific identifier in the ICMP
                message, as defined in RFC 792 for ICMPv4 and in RFC
                2463 for ICMPv6.

                This object, together with natAddrPortBindProtocol,
                natAddrPortBindGlobalAddrType, and
                natAddrPortBindGlobalAddr, constitutes a session
                endpoint in the public realm.  A bind entry binds a
                public realm specific endpoint to a private realm
                specific endpoint, as represented by the tuple of
                (natAddrPortBindLocalPort, natAddrPortBindProtocol,
                natAddrPortBindLocalAddrType, and
                natAddrPortBindLocalAddr)."
       ::= { natAddrPortBindEntry 7 }




Perreault, et al.        Expires March 31, 2014                [Page 31]


Internet-Draft                   NAT MIB                  September 2013


   natAddrPortBindId OBJECT-TYPE
       SYNTAX     NatBindId
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents a bind id that is dynamically
                assigned to each bind by a NAT enabled device.  Each
                bind is represented by a unique bind id across both
                the natAddrBindTable and the natAddrPortBindTable."
       ::= { natAddrPortBindEntry 8 }

   natAddrPortBindTranslationEntity OBJECT-TYPE
       SYNTAX     NatTranslationEntity
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object represents the direction of sessions
                for which this bind is applicable and the entity
                (source or destination) within the sessions that is
                subject to translation with the BIND.

                Orientation of the bind can be a superset of the
                translationEntity of the address map entry that
                forms the basis for this bind.

                For example, if the translationEntity of an
                address map entry is outboundSrcEndPoint, the
                translationEntity of a bind derived from this
                map entry may either be outboundSrcEndPoint or
                may be bidirectional (a bitmask of
                outboundSrcEndPoint and inboundDstEndPoint)."
       ::= { natAddrPortBindEntry 9 }

   natAddrPortBindType OBJECT-TYPE
       SYNTAX     NatAssociationType
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object indicates whether the bind is static or
                dynamic."
       ::= { natAddrPortBindEntry 10 }

   natAddrPortBindMapIndex OBJECT-TYPE
       SYNTAX     NatAddrMapId
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object is a pointer to the natAddrMapTable entry



Perreault, et al.        Expires March 31, 2014                [Page 32]


Internet-Draft                   NAT MIB                  September 2013


                (and the parameters of that entry) used in
                creating this BIND.  This object, in conjunction with
                the ifIndex (which identifies a unique addrMapName),
                points to a unique entry in the natAddrMapTable."
       ::= { natAddrPortBindEntry 11 }

   natAddrPortBindSessions OBJECT-TYPE
       SYNTAX     Gauge32
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "Number of sessions currently using this BIND."
       ::= { natAddrPortBindEntry 12 }

   natAddrPortBindMaxIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated

       DESCRIPTION
               "This object indicates the maximum time for
                which this bind can be idle without any sessions
                attached to it.
                The value of this object is of relevance
                only for dynamic NAT."
       ::= { natAddrPortBindEntry 13 }

   natAddrPortBindCurrentIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "At any given instance, this object indicates the
                time that this bind has been idle without any sessions
                attached to it.

                The value of this object is of relevance
                only for dynamic NAT."
       ::= { natAddrPortBindEntry 14 }

   natAddrPortBindInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of inbound packets that were translated as
                per this bind entry.




Perreault, et al.        Expires March 31, 2014                [Page 33]


Internet-Draft                   NAT MIB                  September 2013


                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrPortBindEntry 15 }

   natAddrPortBindOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of outbound packets that were translated as
                per this bind entry.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natAddrPortBindEntry 16 }

   --
   -- The Session Table
   --

   natSessionTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF NatSessionEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "The (conceptual) table containing one entry for each
                NAT session currently active on this NAT device."
       ::= { natMIBObjects 9 }

   natSessionEntry OBJECT-TYPE
       SYNTAX     NatSessionEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "An entry (conceptual row) containing information
                about an active NAT session on this NAT device.
                These entries are lost upon agent restart."
       INDEX   { ifIndex, natSessionIndex }
       ::= { natSessionTable 1 }

   NatSessionEntry ::= SEQUENCE {
       natSessionIndex                        NatSessionId,
       natSessionPrivateSrcEPBindId           NatBindIdOrZero,
       natSessionPrivateSrcEPBindMode         NatBindMode,



Perreault, et al.        Expires March 31, 2014                [Page 34]


Internet-Draft                   NAT MIB                  September 2013


       natSessionPrivateDstEPBindId           NatBindIdOrZero,
       natSessionPrivateDstEPBindMode         NatBindMode,
       natSessionDirection                    INTEGER,
       natSessionUpTime                       TimeTicks,
       natSessionAddrMapIndex                 NatAddrMapId,
       natSessionProtocolType                 NatProtocolType,
       natSessionPrivateAddrType              InetAddressType,
       natSessionPrivateSrcAddr               InetAddress,
       natSessionPrivateSrcPort               InetPortNumber,
       natSessionPrivateDstAddr               InetAddress,
       natSessionPrivateDstPort               InetPortNumber,
       natSessionPublicAddrType               InetAddressType,
       natSessionPublicSrcAddr                InetAddress,
       natSessionPublicSrcPort                InetPortNumber,
       natSessionPublicDstAddr                InetAddress,
       natSessionPublicDstPort                InetPortNumber,
       natSessionMaxIdleTime                  TimeTicks,
       natSessionCurrentIdleTime              TimeTicks,
       natSessionInTranslates                 Counter64,
       natSessionOutTranslates                Counter64
   }

   natSessionIndex OBJECT-TYPE
       SYNTAX     NatSessionId
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "The session ID for this NAT session."
       ::= { natSessionEntry 1 }

   natSessionPrivateSrcEPBindId OBJECT-TYPE
       SYNTAX     NatBindIdOrZero
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The bind id associated between private and public
                source end points.  In the case of Symmetric-NAT,
                this should be set to zero."
       ::= { natSessionEntry 2 }

   natSessionPrivateSrcEPBindMode OBJECT-TYPE
       SYNTAX     NatBindMode
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object indicates whether the bind indicated
                by the object natSessionPrivateSrcEPBindId
                is an address bind or an address port bind."



Perreault, et al.        Expires March 31, 2014                [Page 35]


Internet-Draft                   NAT MIB                  September 2013


       ::= { natSessionEntry 3 }

   natSessionPrivateDstEPBindId OBJECT-TYPE
       SYNTAX     NatBindIdOrZero
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The bind id associated between private and public
                destination end points."
       ::= { natSessionEntry 4 }

   natSessionPrivateDstEPBindMode OBJECT-TYPE
       SYNTAX     NatBindMode
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object indicates whether the bind indicated
                by the object natSessionPrivateDstEPBindId
                is an address bind or an address port bind."
       ::= { natSessionEntry 5 }

   natSessionDirection OBJECT-TYPE
       SYNTAX     INTEGER {
                      inbound (1),
                      outbound (2)
                  }

       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The direction of this session with respect to the
                local network.  'inbound' indicates that this session
                was initiated from the public network into the private
                network.  'outbound' indicates that this session was
                initiated from the private network into the public
                network."
       ::= { natSessionEntry 6 }

   natSessionUpTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The up time of this session in one-hundredths of a
                second."
       ::= { natSessionEntry 7 }

   natSessionAddrMapIndex OBJECT-TYPE



Perreault, et al.        Expires March 31, 2014                [Page 36]


Internet-Draft                   NAT MIB                  September 2013


       SYNTAX     NatAddrMapId
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "This object is a pointer to the natAddrMapTable entry
                (and the parameters of that entry) used in
                creating this session.  This object, in conjunction with
                the ifIndex (which identifies a unique addrMapName),
                points to a unique entry in the natAddrMapTable."
       ::= { natSessionEntry 8 }

   natSessionProtocolType OBJECT-TYPE
       SYNTAX     NatProtocolType
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The protocol type of this session."
       ::= { natSessionEntry 9 }

   natSessionPrivateAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natSessionPrivateSrcAddr and natSessionPrivateDstAddr."
       ::= { natSessionEntry 10 }

   natSessionPrivateSrcAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The source IP address of the session endpoint that
                lies in the private network.

                The value of this object must be zero only when the
                natSessionPrivateSrcEPBindId object has a zero value.
                When the value of this object is zero, the NAT session
                lookup will match any IP address to this field.

                The type of this address is determined by the value of
                the natSessionPrivateAddrType object."
       ::= { natSessionEntry 11 }

   natSessionPrivateSrcPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS read-only



Perreault, et al.        Expires March 31, 2014                [Page 37]


Internet-Draft                   NAT MIB                  September 2013


       STATUS     deprecated
       DESCRIPTION
               "When the value of protocol is TCP or UDP, this object
                represents the source port in the first packet of
                session while in private-realm.  On the other hand, when
                the protocol is ICMP, a NAT session is created only for
                query/response type ICMP messages such as ICMP echo,
                Timestamp, and Information request messages, and this
                object represents the private-realm specific identifier
                in the ICMP message, as defined in RFC 792 for ICMPv4
                and in RFC 2463 for ICMPv6.

                The value of this object must be zero when the
                natSessionPrivateSrcEPBindId object has zero value
                and value of natSessionPrivateSrcEPBindMode is
                addressPortBind(2).  In such a case, the NAT session
                lookup will match any port number to this field.

                The value of this object must be zero when the object
                is not a representative field (SrcPort, DstPort, or
                ICMP identifier) of the session tuple in either the
                public realm or the private realm."
       ::= { natSessionEntry 12 }

   natSessionPrivateDstAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The destination IP address of the session endpoint that
                lies in the private network.

                The value of this object must be zero when the
                natSessionPrivateDstEPBindId object has a zero value.
                In such a scenario, the NAT session lookup will match
                any IP address to this field.

                The type of this address is determined by the value of
                the natSessionPrivateAddrType object."
       ::= { natSessionEntry 13 }

   natSessionPrivateDstPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "When the value of protocol is TCP or UDP, this object
                represents the destination port in the first packet



Perreault, et al.        Expires March 31, 2014                [Page 38]


Internet-Draft                   NAT MIB                  September 2013


                of session while in private-realm.  On the other hand,
                when the protocol is ICMP, this object is not relevant
                and should be set to zero.

                The value of this object must be zero when the
                natSessionPrivateDstEPBindId object has a zero
                value and natSessionPrivateDstEPBindMode is set to
                addressPortBind(2).  In such a case, the NAT session
                lookup will match any port number to this field.

                The value of this object must be zero when the object
                is not a representative field (SrcPort, DstPort, or
                ICMP identifier) of the session tuple in either the
                public realm or the private realm."
       ::= { natSessionEntry 14 }

   natSessionPublicAddrType OBJECT-TYPE
       SYNTAX      InetAddressType
       MAX-ACCESS  read-only
       STATUS      deprecated
       DESCRIPTION
               "This object specifies the address type used for
                natSessionPublicSrcAddr and natSessionPublicDstAddr."
       ::= { natSessionEntry 15 }

   natSessionPublicSrcAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The source IP address of the session endpoint that
                lies in the public network.

                The value of this object must be zero when the
                natSessionPrivateSrcEPBindId object has a zero value.
                In such a scenario, the NAT session lookup will match
                any IP address to this field.

                The type of this address is determined by the value of
                the natSessionPublicAddrType object."
       ::= { natSessionEntry 16 }

   natSessionPublicSrcPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "When the value of protocol is TCP or UDP, this object



Perreault, et al.        Expires March 31, 2014                [Page 39]


Internet-Draft                   NAT MIB                  September 2013


                represents the source port in the first packet of
                session while in public-realm.  On the other hand, when
                protocol is ICMP, a NAT session is created only for
                query/response type ICMP messages such as ICMP echo,
                Timestamp, and Information request messages, and this
                object represents the public-realm specific identifier
                in the ICMP message, as defined in RFC 792 for ICMPv4
                and in RFC 2463 for ICMPv6.

                The value of this object must be zero when the
                natSessionPrivateSrcEPBindId object has a zero value
                and natSessionPrivateSrcEPBindMode is set to
                addressPortBind(2).  In such a scenario, the NAT
                session lookup will match any port number to this
                field.

                The value of this object must be zero when the object
                is not a representative field (SrcPort, DstPort or
                ICMP identifier) of the session tuple in either the
                public realm or the private realm."
       ::= { natSessionEntry 17 }

   natSessionPublicDstAddr OBJECT-TYPE
       SYNTAX     InetAddress
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The destination IP address of the session endpoint that
                lies in the public network.

                The value of this object must be non-zero when the
                natSessionPrivateDstEPBindId object has a non-zero
                value.  If the value of this object and the
                corresponding natSessionPrivateDstEPBindId object value
                is zero, then the NAT session lookup will match any IP
                address to this field.

                The type of this address is determined by the value of
                the natSessionPublicAddrType object."
       ::= { natSessionEntry 18 }

   natSessionPublicDstPort OBJECT-TYPE
       SYNTAX     InetPortNumber
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "When the value of protocol is TCP or UDP, this object
                represents the destination port in the first packet of



Perreault, et al.        Expires March 31, 2014                [Page 40]


Internet-Draft                   NAT MIB                  September 2013


                session while in public-realm.  On the other hand, when
                the protocol is ICMP, this object is not relevant for
                translation and should be zero.

                The value of this object must be zero when the
                natSessionPrivateDstEPBindId object has a zero value
                and natSessionPrivateDstEPBindMode is
                addressPortBind(2).  In such a scenario, the NAT
                session lookup will match any port number to this
                field.

                The value of this object must be zero when the object
                is not a representative field (SrcPort, DstPort, or
                ICMP identifier) of the session tuple in either the
                public realm or the private realm."
       ::= { natSessionEntry 19 }

   natSessionMaxIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The max time for which this session can be idle
                without detecting a packet."
       ::= { natSessionEntry 20 }

   natSessionCurrentIdleTime OBJECT-TYPE
       SYNTAX     TimeTicks
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The time since a packet belonging to this session was
               last detected."
       ::= { natSessionEntry 21 }

   natSessionInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of inbound packets that were translated for
                this session.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natSessionEntry 22 }



Perreault, et al.        Expires March 31, 2014                [Page 41]


Internet-Draft                   NAT MIB                  September 2013


   natSessionOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of outbound packets that were translated for
                this session.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natSessionEntry 23 }

   --
   -- The Protocol table
   --

   natProtocolTable OBJECT-TYPE
       SYNTAX     SEQUENCE OF NatProtocolEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "The (conceptual) table containing per protocol NAT
                statistics."
       ::= { natMIBObjects 10 }

   natProtocolEntry OBJECT-TYPE
       SYNTAX     NatProtocolEntry
       MAX-ACCESS not-accessible
       STATUS     deprecated
       DESCRIPTION
               "An entry (conceptual row) containing NAT statistics
                pertaining to a particular protocol."
       INDEX   { natProtocol }
       ::= { natProtocolTable 1 }

   NatProtocolEntry ::= SEQUENCE {
       natProtocol                 NatProtocolType,
       natProtocolInTranslates     Counter64,
       natProtocolOutTranslates    Counter64,
       natProtocolDiscards         Counter64
   }

   natProtocol    OBJECT-TYPE
       SYNTAX     NatProtocolType
       MAX-ACCESS not-accessible
       STATUS     deprecated



Perreault, et al.        Expires March 31, 2014                [Page 42]


Internet-Draft                   NAT MIB                  September 2013


       DESCRIPTION
               "This object represents the protocol pertaining to which
                parameters are reported."
       ::= { natProtocolEntry 1 }

   natProtocolInTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of inbound packets pertaining to the protocol
                identified by natProtocol that underwent NAT.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natProtocolEntry 2 }

   natProtocolOutTranslates OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of outbound packets pertaining to the
                protocol identified by natProtocol that underwent NAT.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."
       ::= { natProtocolEntry 3 }

   natProtocolDiscards OBJECT-TYPE
       SYNTAX     Counter64
       MAX-ACCESS read-only
       STATUS     deprecated
       DESCRIPTION
               "The number of packets pertaining to the protocol
                identified by natProtocol that had to be
                rejected/dropped due to lack of resources.  These
                rejections could be due to session timeout, resource
                unavailability, lack of address space, etc.

                Discontinuities in the value of this counter can occur
                at reinitialization of the management system and at
                other times, as indicated by the value of
                ifCounterDiscontinuityTime on the relevant interface."



Perreault, et al.        Expires March 31, 2014                [Page 43]


Internet-Draft                   NAT MIB                  September 2013


        ::= { natProtocolEntry 4 }

   --
   -- Notifications section
   --

   natMIBNotifications OBJECT IDENTIFIER ::= { natMIB 0 }

   --
   -- Notifications
   --

   natPacketDiscard NOTIFICATION-TYPE
       OBJECTS { ifIndex }
       STATUS  deprecated
       DESCRIPTION
               "This notification is generated when IP packets are
                discarded by the NAT function; e.g., due to lack of
                mapping space when NAT is out of addresses or ports.

                Note that the generation of natPacketDiscard
                notifications is throttled by the agent, as specified
                by the 'natNotifThrottlingInterval' object."
       ::= { natMIBNotifications 1 }



   --
   -- Conformance information.
   --

   natMIBConformance OBJECT IDENTIFIER ::= { natMIB 2 }

   natMIBGroups      OBJECT IDENTIFIER ::= { natMIBConformance 1 }
   natMIBCompliances OBJECT IDENTIFIER ::= { natMIBConformance 2 }

   --
   -- Units of conformance
   --

   natConfigGroup OBJECT-GROUP
       OBJECTS { natInterfaceRealm,
                 natInterfaceServiceType,
                 natInterfaceStorageType,
                 natInterfaceRowStatus,
                 natAddrMapName,
                 natAddrMapEntryType,
                 natAddrMapTranslationEntity,



Perreault, et al.        Expires March 31, 2014                [Page 44]


Internet-Draft                   NAT MIB                  September 2013


                 natAddrMapLocalAddrType,
                 natAddrMapLocalAddrFrom,
                 natAddrMapLocalAddrTo,
                 natAddrMapLocalPortFrom,
                 natAddrMapLocalPortTo,
                 natAddrMapGlobalAddrType,
                 natAddrMapGlobalAddrFrom,
                 natAddrMapGlobalAddrTo,
                 natAddrMapGlobalPortFrom,
                 natAddrMapGlobalPortTo,
                 natAddrMapProtocol,
                 natAddrMapStorageType,
                 natAddrMapRowStatus,
                 natBindDefIdleTimeout,
                 natUdpDefIdleTimeout,
                 natIcmpDefIdleTimeout,
                 natOtherDefIdleTimeout,
                 natTcpDefIdleTimeout,
                 natTcpDefNegTimeout,
                 natNotifThrottlingInterval }
       STATUS  deprecated
       DESCRIPTION
               "A collection of configuration-related information
                required to support management of devices supporting
                NAT."
       ::= { natMIBGroups 1 }

   natTranslationGroup OBJECT-GROUP
       OBJECTS { natAddrBindNumberOfEntries,
                 natAddrBindGlobalAddrType,
                 natAddrBindGlobalAddr,
                 natAddrBindId,
                 natAddrBindTranslationEntity,
                 natAddrBindType,
                 natAddrBindMapIndex,
                 natAddrBindSessions,
                 natAddrBindMaxIdleTime,
                 natAddrBindCurrentIdleTime,
                 natAddrBindInTranslates,
                 natAddrBindOutTranslates,
                 natAddrPortBindNumberOfEntries,
                 natAddrPortBindGlobalAddrType,
                 natAddrPortBindGlobalAddr,
                 natAddrPortBindGlobalPort,
                 natAddrPortBindId,
                 natAddrPortBindTranslationEntity,
                 natAddrPortBindType,
                 natAddrPortBindMapIndex,



Perreault, et al.        Expires March 31, 2014                [Page 45]


Internet-Draft                   NAT MIB                  September 2013


                 natAddrPortBindSessions,
                 natAddrPortBindMaxIdleTime,
                 natAddrPortBindCurrentIdleTime,
                 natAddrPortBindInTranslates,
                 natAddrPortBindOutTranslates,
                 natSessionPrivateSrcEPBindId,
                 natSessionPrivateSrcEPBindMode,
                 natSessionPrivateDstEPBindId,
                 natSessionPrivateDstEPBindMode,
                 natSessionDirection,
                 natSessionUpTime,
                 natSessionAddrMapIndex,
                 natSessionProtocolType,
                 natSessionPrivateAddrType,
                 natSessionPrivateSrcAddr,
                 natSessionPrivateSrcPort,
                 natSessionPrivateDstAddr,
                 natSessionPrivateDstPort,
                 natSessionPublicAddrType,
                 natSessionPublicSrcAddr,
                 natSessionPublicSrcPort,
                 natSessionPublicDstAddr,
                 natSessionPublicDstPort,
                 natSessionMaxIdleTime,
                 natSessionCurrentIdleTime,
                 natSessionInTranslates,
                 natSessionOutTranslates }
       STATUS  deprecated

       DESCRIPTION
               "A collection of BIND-related objects required to support
                management of devices supporting NAT."
       ::= { natMIBGroups 2 }

   natStatsInterfaceGroup OBJECT-GROUP
       OBJECTS { natInterfaceInTranslates,
                 natInterfaceOutTranslates,
                 natInterfaceDiscards }
       STATUS  deprecated
       DESCRIPTION
               "A collection of NAT statistics associated with the
                interface on which NAT is configured, to aid
                troubleshooting/monitoring of the NAT operation."
       ::= { natMIBGroups 3 }

   natStatsProtocolGroup OBJECT-GROUP
       OBJECTS { natProtocolInTranslates,
                 natProtocolOutTranslates,



Perreault, et al.        Expires March 31, 2014                [Page 46]


Internet-Draft                   NAT MIB                  September 2013


                 natProtocolDiscards }
       STATUS  deprecated
       DESCRIPTION
               "A collection of protocol specific NAT statistics,
                to aid troubleshooting/monitoring of NAT operation."
       ::= { natMIBGroups 4 }

   natStatsAddrMapGroup OBJECT-GROUP
       OBJECTS { natAddrMapInTranslates,
                 natAddrMapOutTranslates,
                 natAddrMapDiscards,
                 natAddrMapAddrUsed }
       STATUS  deprecated
       DESCRIPTION
               "A collection of address map specific NAT statistics,
                to aid troubleshooting/monitoring of NAT operation."
       ::= { natMIBGroups 5 }

   natMIBNotificationGroup NOTIFICATION-GROUP
       NOTIFICATIONS { natPacketDiscard }
       STATUS        deprecated
       DESCRIPTION
               "A collection of notifications generated by
               devices supporting this MIB."
       ::= { natMIBGroups 6 }


   --
   -- Compliance statements
   --

   natMIBFullCompliance MODULE-COMPLIANCE
       STATUS  deprecated
       DESCRIPTION
               "When this MIB is implemented with support for
                read-create, then such an implementation can claim
                full compliance.  Such devices can then be both
                monitored and configured with this MIB.

                The following index objects cannot be added as OBJECT
                clauses but nevertheless have the compliance
                requirements:
                    "
                -- OBJECT  natAddrBindLocalAddrType
                -- SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending



Perreault, et al.        Expires March 31, 2014                [Page 47]


Internet-Draft                   NAT MIB                  September 2013


                --          on its support for IPv4 and IPv6."

                -- OBJECT  natAddrBindLocalAddr
                -- SYNTAX  InetAddress (SIZE(4|16))
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

                -- OBJECT  natAddrPortBindLocalAddrType
                -- SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

                -- OBJECT  natAddrPortBindLocalAddr
                -- SYNTAX  InetAddress (SIZE(4|16))
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

       MODULE IF-MIB -- The interfaces MIB, RFC2863
         MANDATORY-GROUPS {
           ifCounterDiscontinuityGroup
         }

       MODULE  -- this module
         MANDATORY-GROUPS { natConfigGroup, natTranslationGroup,
                            natStatsInterfaceGroup }

         GROUP       natStatsProtocolGroup
         DESCRIPTION
                  "This group is optional."
         GROUP       natStatsAddrMapGroup
         DESCRIPTION
                  "This group is optional."
         GROUP       natMIBNotificationGroup
         DESCRIPTION
                  "This group is optional."

         OBJECT  natAddrMapLocalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."



Perreault, et al.        Expires March 31, 2014                [Page 48]


Internet-Draft                   NAT MIB                  September 2013


         OBJECT  natAddrMapLocalAddrFrom
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrMapLocalAddrTo
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrFrom
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrTo
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrBindGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrBindGlobalAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."



Perreault, et al.        Expires March 31, 2014                [Page 49]


Internet-Draft                   NAT MIB                  September 2013


         OBJECT  natAddrPortBindGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natAddrPortBindGlobalAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natSessionPrivateAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natSessionPrivateSrcAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."


         OBJECT  natSessionPrivateDstAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natSessionPublicAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

         OBJECT  natSessionPublicSrcAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support



Perreault, et al.        Expires March 31, 2014                [Page 50]


Internet-Draft                   NAT MIB                  September 2013


                  for IPv4 and IPv6."

         OBJECT  natSessionPublicDstAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support
                  for IPv4 and IPv6."

       ::= { natMIBCompliances 1 }

   natMIBReadOnlyCompliance MODULE-COMPLIANCE
       STATUS  deprecated
       DESCRIPTION
               "When this MIB is implemented without support for
                read-create (i.e., in read-only mode), then such an
                implementation can claim read-only compliance.
                Such a device can then be monitored but cannot be
                configured with this MIB.

                The following index objects cannot be added as OBJECT
                clauses but nevertheless have the compliance
                requirements:
                "
                -- OBJECT  natAddrBindLocalAddrType
                -- SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

                -- OBJECT  natAddrBindLocalAddr
                -- SYNTAX  InetAddress (SIZE(4|16))

                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

                -- OBJECT  natAddrPortBindLocalAddrType
                -- SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
                -- DESCRIPTION
                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."
                -- OBJECT  natAddrPortBindLocalAddr
                -- SYNTAX  InetAddress (SIZE(4|16))
                -- DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 51]


Internet-Draft                   NAT MIB                  September 2013


                --         "An implementation is required to support
                --          global IPv4 and/or IPv6 addresses, depending
                --          on its support for IPv4 and IPv6."

       MODULE IF-MIB -- The interfaces MIB, RFC2863
         MANDATORY-GROUPS {
           ifCounterDiscontinuityGroup
         }

       MODULE  -- this module
         MANDATORY-GROUPS { natConfigGroup, natTranslationGroup,
                            natStatsInterfaceGroup }

         GROUP       natStatsProtocolGroup
         DESCRIPTION
                  "This group is optional."
         GROUP       natStatsAddrMapGroup
         DESCRIPTION
                  "This group is optional."
         GROUP       natMIBNotificationGroup
         DESCRIPTION
                  "This group is optional."
         OBJECT natInterfaceRowStatus
         SYNTAX RowStatus { active(1) }
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required, and active is the only
                  status that needs to be supported."

         OBJECT  natAddrMapLocalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT  natAddrMapLocalAddrFrom
         SYNTAX  InetAddress (SIZE(4|16))
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT  natAddrMapLocalAddrTo
         SYNTAX  InetAddress (SIZE(4|16))
         MIN-ACCESS   read-only



Perreault, et al.        Expires March 31, 2014                [Page 52]


Internet-Draft                   NAT MIB                  September 2013


         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrFrom
         SYNTAX  InetAddress (SIZE(4|16))
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT  natAddrMapGlobalAddrTo
         SYNTAX  InetAddress (SIZE(4|16))
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required.  An implementation is
                  required to support global IPv4 and/or IPv6 addresses,
                  depending on its support for IPv4 and IPv6."

         OBJECT natAddrMapRowStatus
         SYNTAX RowStatus { active(1) }
         MIN-ACCESS   read-only
         DESCRIPTION
                 "Write access is not required, and active is the only
                  status that needs to be supported."

         OBJECT  natAddrBindGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natAddrBindGlobalAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for



Perreault, et al.        Expires March 31, 2014                [Page 53]


Internet-Draft                   NAT MIB                  September 2013


                  IPv4 and IPv6."

         OBJECT  natAddrPortBindGlobalAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natAddrPortBindGlobalAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPrivateAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPrivateSrcAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPrivateDstAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPublicAddrType
         SYNTAX  InetAddressType { ipv4(1), ipv6(2) }
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPublicSrcAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4



Perreault, et al.        Expires March 31, 2014                [Page 54]


Internet-Draft                   NAT MIB                  September 2013


                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

         OBJECT  natSessionPublicDstAddr
         SYNTAX  InetAddress (SIZE(4|16))
         DESCRIPTION
                 "An implementation is required to support global IPv4
                  and/or IPv6 addresses, depending on its support for
                  IPv4 and IPv6."

       ::= { natMIBCompliances 2 }


   --===================================================================
   -- END OF DEPRECATED OBJECTS. CURRENT OBJECTS FOLLOW.


   -- textual conventions

   ProtocolNumber ::= TEXTUAL-CONVENTION
       DISPLAY-HINT "d"
       STATUS current
       DESCRIPTION
           "A transport protocol number, from the 'protocol-numbers'
            IANA registry."
       SYNTAX Unsigned32 (0..255)

   NatPoolId ::= TEXTUAL-CONVENTION
       DISPLAY-HINT "d"
       STATUS current
       DESCRIPTION
           "A unique ID that is assigned to each pool."
       SYNTAX Unsigned32 (1..4294967295)

   NatBehaviorType ::= TEXTUAL-CONVENTION
       STATUS current
       DESCRIPTION
           "Behavior type as described in [RFC4787] sections 4.1 and 5."
       SYNTAX INTEGER {
           endpointIndependent (0),
           addressDependent (1),
           addressAndPortDependent (2)
       }

   NatPoolingType ::= TEXTUAL-CONVENTION
       STATUS current
       DESCRIPTION
           "Pooling type as described in [RFC4787] sections 4.1."



Perreault, et al.        Expires March 31, 2014                [Page 55]


Internet-Draft                   NAT MIB                  September 2013


       SYNTAX INTEGER {
           arbitrary (0),
           paired (1)
       }


   -- notifications

   natNotifPoolWatermarkLow NOTIFICATION-TYPE
       OBJECTS { natPoolIndex }
       STATUS current
       DESCRIPTION
           "This notification is generated when the specified pool's
            usage percentage becomes lower than or equal to the
            specified threshold. The threshold is specified by the
            natPoolWatermarkLow object"
       ::= { natMIBNotifications 2 }

   natNotifPoolWatermarkHigh NOTIFICATION-TYPE
       OBJECTS { natPoolIndex }
       STATUS current
       DESCRIPTION
           "This notification is generated when the specified pool's
            usage percentage becomes greater than or equal to the
            specified threshold. The threshold is specified by the
            natPoolWatermarkHigh object"
       ::= { natMIBNotifications 3 }

   natNotifMappings NOTIFICATION-TYPE
       OBJECTS { natMappingCreations, natMappingRemovals }
       STATUS current
       DESCRIPTION
           "This notification is generated when the number of active
            mappings exceeds the value of natMappingsNotifyThreshold."
       ::= { natMIBNotifications 4 }

   natNotifAddrMappings NOTIFICATION-TYPE
       OBJECTS { natAddressMappingCreations, natAddressMappingRemovals }
       STATUS current
       DESCRIPTION
           "This notification is generated when the number of active
            address mappings exceeds the value of
            natAddrMapNotifyThreshold."
       ::= { natMIBNotifications 5 }

   natNotifSubscriberMappings NOTIFICATION-TYPE
       OBJECTS { natSubscriberMappingCreations,
                 natSubscriberMappingRemovals }



Perreault, et al.        Expires March 31, 2014                [Page 56]


Internet-Draft                   NAT MIB                  September 2013


       STATUS current
       DESCRIPTION
           "This notification is generated when the number of active
            mappings exceeds the value of natSubscriberMapNotifyThresh,
            unless natSubscriberMapNotifyThresh is zero.."
       ::= { natMIBNotifications 6 }


   -- counters

   natCounters OBJECT IDENTIFIER ::= { natMIBObjects 11 }

   natTranslations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets translated."
       ::= { natCounters 1 }

   natOutOfPortErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets not translated because no external
            port was available, excluding quota limitations."
       ::= { natCounters 2 }

   natResourceErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets not translated because of resource
            constraints (excluding out-of-ports error and quota drops)."
       ::= { natCounters 3 }

   natQuotaDrops OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of incoming packets not translated because of
            quota limitations.  Quotas include absolute limits as well
            as limits on rate of allocation."
       ::= { natCounters 4 }




Perreault, et al.        Expires March 31, 2014                [Page 57]


Internet-Draft                   NAT MIB                  September 2013


   natMappingCreations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mapping creations. This includes static mappings."
       ::= { natCounters 5 }

   natMappingRemovals OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mapping removals. This includes static mappings."
       ::= { natCounters 6 }

   natAddressMappingCreations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of address mapping creations. This includes static
            mappings."
       ::= { natCounters 7 }

   natAddressMappingRemovals OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of address mapping removals. This includes static
            mappings.

            The number of active mappings is equal to
            natAddressMappingCreations - natAddressMappingRemovals."
       ::= { natCounters 8 }

   natL4ProtocolTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatPerProtocolEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Table of protocols with per-protocol counters."
       ::= { natCounters 128 }

   natL4ProtocolEntry OBJECT-TYPE
       SYNTAX NatPerProtocolEntry
       MAX-ACCESS not-accessible



Perreault, et al.        Expires March 31, 2014                [Page 58]


Internet-Draft                   NAT MIB                  September 2013


       STATUS current
       DESCRIPTION
           "Per-protocol counters."
       INDEX { natL4ProtocolNumber }
       ::= { natL4ProtocolTable 1 }

   NatPerProtocolEntry ::=
       SEQUENCE {
           natL4ProtocolNumber            ProtocolNumber,
           natL4ProtocolTranslations      Counter64,
           natL4ProtocolOutOfPortErrors   Counter64,
           natL4ProtocolResourceErrors    Counter64,
           natL4ProtocolQuotaDrops        Counter64,
           natL4ProtocolMappingCreations  Counter64,
           natL4ProtocolMappingRemovals   Counter64
       }

   natL4ProtocolNumber OBJECT-TYPE
       SYNTAX ProtocolNumber
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Counters in this conceptual row apply to packets using the
            transport protocol identified by this object's value."
       ::= { natL4ProtocolEntry 1 }

   natL4ProtocolTranslations  OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets translated."
       ::= { natL4ProtocolEntry 2 }

   natL4ProtocolOutOfPortErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets not translated because no external
            port was available."
       ::= { natL4ProtocolEntry 3 }

   natL4ProtocolResourceErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 59]


Internet-Draft                   NAT MIB                  September 2013


           "The number of packets not translated because of resource
            constraints (excluding out-of-ports errors and quota
            drops)."
       ::= { natL4ProtocolEntry 4 }

   natL4ProtocolQuotaDrops OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of incoming packets not translated because of
            exceeded quotas. Quotas include absolute limits as well as
            limits on rate of allocation."
       ::= { natL4ProtocolEntry 5 }

   natL4ProtocolMappingCreations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mapping creations. This includes static mappings."
       ::= { natL4ProtocolEntry 6 }

   natL4ProtocolMappingRemovals OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mapping removals. This includes static mappings.

            The number of active mappings is equal to
            natL4ProtocolMappingCreations -
            natL4ProtocolMappingRemovals."
       ::= { natL4ProtocolEntry 7 }


   -- limits

   natLimits OBJECT IDENTIFIER ::= { natMIBObjects 12 }

   natLimitMappings OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "Global limit on the total number of mappings. Zero means
            unlimited."
       ::= { natLimits 1 }



Perreault, et al.        Expires March 31, 2014                [Page 60]


Internet-Draft                   NAT MIB                  September 2013


   natMappingsNotifyThreshold OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "See natNotifMappings."
       ::= { natLimits 2 }

   natLimitAddressMappings OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "Global limit on the total number of internal-to-external
            address mappings.  Zero means unlimited.

            This limit is only applicable to NATs that have an 'IP
            address pooling' behavior of 'Paired' [RFC4787]."
       ::= { natLimits 3 }

   natAddrMapNotifyThreshold OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "See natNotifAddrMappings."
       ::= { natLimits 4 }

   natLimitFragments OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "Global limit on the total number of fragments pending
            reassembly.  Zero means unlimited.

            This limit is only applicable to NATs having 'Receive
            Fragments Out of Order' behavior [RFC4787]."
       ::= { natLimits 5 }

   natLimitSubscribers OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "Global limit on the number of subscribers with active
            mappings.  Zero means unlimited."
       ::= { natLimits 6 }



Perreault, et al.        Expires March 31, 2014                [Page 61]


Internet-Draft                   NAT MIB                  September 2013


   -- pools

   natPoolObjects OBJECT IDENTIFIER ::= { natMIBObjects 13 }

   natPoolTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatPoolEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Table of pools."
       ::= { natPoolObjects 1 }

   natPoolEntry OBJECT-TYPE
       SYNTAX NatPoolEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Entry in the table of pools."
       INDEX { natPoolIndex }
       ::= { natPoolTable 1 }

   NatPoolEntry ::=
       SEQUENCE {
           natPoolIndex         NatPoolId,
           natPoolRealm         SnmpAdminString,
           natPoolUsage         Integer32,
           natPoolWatermarkLow  Integer32,
           natPoolWatermarkHigh Integer32,
           natPoolPortMin       InetPortNumber,
           natPoolPortMax       InetPortNumber
       }

   natPoolIndex OBJECT-TYPE
       SYNTAX NatPoolId
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Index of an address pool."
       ::= { natPoolEntry 1 }

   natPoolRealm OBJECT-TYPE
       SYNTAX SnmpAdminString (SIZE (0..32))
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Realm to which this pool's addresses belong."
       ::= { natPoolEntry 2 }




Perreault, et al.        Expires March 31, 2014                [Page 62]


Internet-Draft                   NAT MIB                  September 2013


   natPoolUsage OBJECT-TYPE
       SYNTAX Integer32 (0..100)
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Percentage of the pool's total number of external ports
            currently mapped."
       ::= { natPoolEntry 3 }

   natPoolWatermarkLow OBJECT-TYPE
       SYNTAX Integer32 (-1|0..100)
       MAX-ACCESS read-create
       STATUS current
       DESCRIPTION
           "Low watermark on a pool's usage, in percentage of the total
            number of ports available. If set to -1, the watermark is
            disabled. Otherwise when natPoolUsage becomes lower than or
            equal to natPoolWatermarkLow, a notification is sent. The
            NAT may also start behaving in low usage mode (this is
            implementation-defined)."
       ::= { natPoolEntry 4 }

   natPoolWatermarkHigh OBJECT-TYPE
       SYNTAX Integer32 (-1|0..100)
       MAX-ACCESS read-create
       STATUS current
       DESCRIPTION
           "High watermark on a pool's usage, in percentage of the total
            number of ports available. If set to -1, the watermark is
            disabled. Otherwise, when natPoolUsage becomes higher than
            or equal to natPoolWatermarkHigh, a notification is sent.
            The NAT may also start behaving in high usage mode (this is
            implementation-defined)."
       ::= { natPoolEntry 5 }

   natPoolPortMin OBJECT-TYPE
       SYNTAX InetPortNumber
       MAX-ACCESS read-create
       STATUS current
       DESCRIPTION
           "Minimal port number to be allocated in this pool."
       ::= { natPoolEntry 6 }

   natPoolPortMax OBJECT-TYPE
       SYNTAX InetPortNumber
       MAX-ACCESS read-create
       STATUS current
       DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 63]


Internet-Draft                   NAT MIB                  September 2013


           "Maximal port number to be allocated in this pool."
       ::= { natPoolEntry 7 }


   natPoolRangeTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatPoolRangeEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "This table contains address ranges used by pool entries."
       ::= { natPoolObjects 2 }

   natPoolRangeEntry OBJECT-TYPE
       SYNTAX NatPoolRangeEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "NAT pool address range."
       INDEX { natPoolRangeType,
               natPoolRangeBegin }
       ::= { natPoolRangeTable 1 }

   NatPoolRangeEntry ::=
       SEQUENCE {
           natPoolRangePoolIndex        NatPoolId,
           natPoolRangeType             InetAddressType,
           natPoolRangeBegin            InetAddress,
           natPoolRangeEnd              InetAddress,
           natPoolRangeAllocatedPorts   Gauge32
       }

   natPoolRangePoolIndex OBJECT-TYPE
       SYNTAX NatPoolId
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Index of the address pool to which this address range
            belongs.  See natPoolIndex."
       ::= { natPoolRangeEntry 1 }

   natPoolRangeType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "The address type of natPoolRangeBegin and
            natPoolRangeEnd."
       ::= { natPoolRangeEntry 2 }



Perreault, et al.        Expires March 31, 2014                [Page 64]


Internet-Draft                   NAT MIB                  September 2013


   natPoolRangeBegin OBJECT-TYPE
       SYNTAX InetAddress (SIZE (4|16))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Lowest address included in this range."
       ::= { natPoolRangeEntry 3 }

   natPoolRangeEnd OBJECT-TYPE
       SYNTAX InetAddress (SIZE (4|16))
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Highest address included in this range."
       ::= { natPoolRangeEntry 4 }

   natPoolRangeAllocatedPorts OBJECT-TYPE
       SYNTAX Gauge32
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of ports currently allocated on the addresses in this
            range."
       ::= { natPoolRangeEntry 5 }


   -- indexed mapping tables

   natMapObjects OBJECT IDENTIFIER ::= { natMIBObjects 14 }

   natMapIntAddrTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatMapIntAddrEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Table of mappings from internal to external address.

            This table is only applicable to NATs that have an 'IP
            address pooling' behavior of 'Paired' [RFC4787]."
       ::= { natMapObjects 1 }

   natMapIntAddrEntry OBJECT-TYPE
       SYNTAX NatMapIntAddrEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Mapping from internal to external address."
       INDEX { natMapIntAddrIntRealm,



Perreault, et al.        Expires March 31, 2014                [Page 65]


Internet-Draft                   NAT MIB                  September 2013


               natMapIntAddrIntType,
               natMapIntAddrInt }
       ::= { natMapIntAddrTable 1 }

   NatMapIntAddrEntry ::=
       SEQUENCE {
           natMapIntAddrIntRealm   SnmpAdminString,
           natMapIntAddrExtRealm   SnmpAdminString,
           natMapIntAddrIntType    InetAddressType,
           natMapIntAddrInt        InetAddress,
           natMapIntAddrExtType    InetAddressType,
           natMapIntAddrExt        InetAddress
       }

   natMapIntAddrIntRealm OBJECT-TYPE
       SYNTAX SnmpAdminString (SIZE(0..32))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Realm to which natMapIntAddrInt belongs."
       ::= { natMapIntAddrEntry 1 }

   natMapIntAddrExtRealm OBJECT-TYPE
       SYNTAX SnmpAdminString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Realm to which natMapIntAddrExt belongs."
       ::= { natMapIntAddrEntry 2 }

   natMapIntAddrIntType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Address type for natMapIntAddrInt."
       ::= { natMapIntAddrEntry 3 }

   natMapIntAddrInt OBJECT-TYPE
       SYNTAX InetAddress (SIZE (4|16))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Internal address."
       ::= { natMapIntAddrEntry 4 }

   natMapIntAddrExtType OBJECT-TYPE
       SYNTAX InetAddressType



Perreault, et al.        Expires March 31, 2014                [Page 66]


Internet-Draft                   NAT MIB                  September 2013


       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Address type for natMapIntAddrExt."
       ::= { natMapIntAddrEntry 5 }

   natMapIntAddrExt OBJECT-TYPE
       SYNTAX InetAddress
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "External address."
       ::= { natMapIntAddrEntry 6 }

   natMappingTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatMappingTableEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Table of mappings indexed by external 3-tuple."
       ::= { natMapObjects 2 }

   natMappingTableEntry OBJECT-TYPE
       SYNTAX NatMappingTableEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "A single NAT mapping."
       INDEX { natMappingProto,
               natMappingExtRealm,
               natMappingExtAddressType,
               natMappingExtAddress,
               natMappingExtPort }
       ::= { natMappingTable 1 }

   NatMappingTableEntry ::=
       SEQUENCE {
           natMappingProto          ProtocolNumber,
           natMappingExtRealm       SnmpAdminString,
           natMappingExtAddressType InetAddressType,
           natMappingExtAddress     InetAddress,
           natMappingExtPort        InetPortNumber,
           natMappingIntRealm       SnmpAdminString,
           natMappingIntAddressType InetAddressType,
           natMappingIntAddress     InetAddress,
           natMappingIntPort        InetPortNumber,
           natMappingPool           Unsigned32,
           natMappingMapBehavior    NatBehaviorType,



Perreault, et al.        Expires March 31, 2014                [Page 67]


Internet-Draft                   NAT MIB                  September 2013


           natMappingFilterBehavior NatBehaviorType,
           natMappingAddressPooling NatPoolingType
       }

   natMappingProto OBJECT-TYPE
       SYNTAX ProtocolNumber
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "The mapping's transport protocol number."
       ::= { natMappingTableEntry 1 }

   natMappingExtRealm OBJECT-TYPE
       SYNTAX SnmpAdminString (SIZE(0..32))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "The realm to which natMappingExtAddress belongs."
       ::= { natMappingTableEntry 2 }

   natMappingExtAddressType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Type of the mapping's external address."
       ::= { natMappingTableEntry 3 }

   natMappingExtAddress OBJECT-TYPE
       SYNTAX InetAddress (SIZE (4|16))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "The mapping's external address. If this is the undefined
            address, all external addresses are mapped to the internal
            address."
       ::= { natMappingTableEntry 4 }

   natMappingExtPort OBJECT-TYPE
       SYNTAX InetPortNumber
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "The mapping's external port number. If this is zero, all
            external ports are mapped to the internal port."
       ::= { natMappingTableEntry 5 }

   natMappingIntRealm OBJECT-TYPE



Perreault, et al.        Expires March 31, 2014                [Page 68]


Internet-Draft                   NAT MIB                  September 2013


       SYNTAX SnmpAdminString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The realm to which natMappingIntAddress belongs."
       ::= { natMappingTableEntry 6 }

   natMappingIntAddressType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Type of the mapping's internal address."
       ::= { natMappingTableEntry 7 }

   natMappingIntAddress OBJECT-TYPE
       SYNTAX InetAddress
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The mapping's internal address. If this is the undefined
            address, addresses are not translated."
       ::= { natMappingTableEntry 8 }

   natMappingIntPort OBJECT-TYPE
       SYNTAX InetPortNumber
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The mapping's internal port number. If this is zero, ports
            are not translated."
       ::= { natMappingTableEntry 9 }

   natMappingPool OBJECT-TYPE
       SYNTAX Unsigned32 (0|1..4294967295)
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Index of the pool that contains this mapping's external
            address and port. If zero, no pool is associated with this
            mapping."
       ::= { natMappingTableEntry 10 }

   natMappingMapBehavior OBJECT-TYPE
       SYNTAX NatBehaviorType
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION



Perreault, et al.        Expires March 31, 2014                [Page 69]


Internet-Draft                   NAT MIB                  September 2013


           "Mapping behavior as described in [RFC4787] section 4.1."
       ::= { natMappingTableEntry 11 }

   natMappingFilterBehavior OBJECT-TYPE
       SYNTAX NatBehaviorType
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Filtering behavior as described in [RFC4787] section 5."
       ::= { natMappingTableEntry 12 }

   natMappingAddressPooling OBJECT-TYPE
       SYNTAX NatPoolingType
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Type of address pooling behavior that was used to create
            this mapping."
       ::= { natMappingTableEntry 13 }

   -- subscribers

   natSubscribers OBJECT IDENTIFIER ::= { natMIBObjects 15 }

   natSubscribersTable OBJECT-TYPE
       SYNTAX SEQUENCE OF NatSubscribersTableEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Table of CGN subscribers."
       ::= { natSubscribers 1 }

   natSubscribersTableEntry OBJECT-TYPE
       SYNTAX NatSubscribersTableEntry
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Each entry describes a single CGN subscriber."
       INDEX { natSubscriberIdentifierType,
               natSubscriberIdentifier }
       ::= { natSubscribersTable 1 }

   NatSubscribersTableEntry ::=
       SEQUENCE {
           natSubscriberIdentifierType      InetAddressType,
           natSubscriberIdentifier          InetAddress,
           natSubscriberIntPrefixType       InetAddressType,
           natSubscriberIntPrefix           InetAddress,



Perreault, et al.        Expires March 31, 2014                [Page 70]


Internet-Draft                   NAT MIB                  September 2013


           natSubscriberIntPrefixLength     InetAddressPrefixLength,
           natSubscriberRealm               SnmpAdminString,
           natSubscriberPool                Unsigned32,
           natSubscriberTranslations        Counter64,
           natSubscriberOutOfPortErrors     Counter64,
           natSubscriberResourceErrors      Counter64,
           natSubscriberQuotaDrops          Counter64,
           natSubscriberMappingCreations    Counter64,
           natSubscriberMappingRemovals     Counter64,
           natSubscriberLimitMappings       Unsigned32,
           natSubscriberMapNotifyThresh     Unsigned32
       }

   natSubscriberIdentifierType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Address type of the subscriber identifier."
       ::= { natSubscribersTableEntry 1 }

   natSubscriberIdentifier OBJECT-TYPE
       SYNTAX InetAddress (SIZE (4|16))
       MAX-ACCESS not-accessible
       STATUS current
       DESCRIPTION
           "Address used for uniquely identifying the subscriber.

            In traditional NAT, this is the internal address assigned to
            the CPE. In case an address range is assigned to a
            subscriber, the first address in the range is used as
            identifier. For tunnelled connectivity (e.g., DS-Lite
            [RFC6333]), the outer address is used as identifier (i.e.,
            the IPv6 address in the case of DS-Lite)."
       ::= { natSubscribersTableEntry 2 }

   natSubscriberIntPrefixType OBJECT-TYPE
       SYNTAX InetAddressType
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Subscriber's internal prefix type."
       ::= { natSubscribersTableEntry 3 }

   natSubscriberIntPrefix OBJECT-TYPE
       SYNTAX InetAddress
       MAX-ACCESS read-only
       STATUS current



Perreault, et al.        Expires March 31, 2014                [Page 71]


Internet-Draft                   NAT MIB                  September 2013


       DESCRIPTION
           "Prefix assigned to a subscriber's CPE."
       ::= { natSubscribersTableEntry 4 }

   natSubscriberIntPrefixLength OBJECT-TYPE
       SYNTAX InetAddressPrefixLength
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Length of the prefix assigned to a subscriber's CPE, in
            bits.  In case a single address is assigned, this will be 32
            for IPv4 and 128 for IPv6."
       ::= { natSubscribersTableEntry 5 }

   natSubscriberRealm OBJECT-TYPE
       SYNTAX SnmpAdminString
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The realm to which this subscriber belongs."
       ::= { natSubscribersTableEntry 6 }

   natSubscriberPool OBJECT-TYPE
       SYNTAX Unsigned32 (0|1..4294967295)
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "External address pool to which this subscriber belongs, or
            zero if the subscriber does not belong to any pool."
       ::= { natSubscribersTableEntry 7 }

   natSubscriberTranslations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of translated packets received from or sent to
            this subscriber."
       ::= { natSubscribersTableEntry 8 }

   natSubscriberOutOfPortErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets received from this subscriber not
            translated because no external port was available, excluding
            quota limitations."



Perreault, et al.        Expires March 31, 2014                [Page 72]


Internet-Draft                   NAT MIB                  September 2013


       ::= { natSubscribersTableEntry 9 }

   natSubscriberResourceErrors OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of packets received from this subscriber not
            translated because of resource constraints (excluding
            out-of-port errors and quota drops)."
       ::= { natSubscribersTableEntry 10 }

   natSubscriberQuotaDrops OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "The number of incoming packets received from or destined to
            this subscriber not translated because of quota limitations.
            Quotas include absolute limits as well as limits on the rate
            of allocation."
       ::= { natSubscribersTableEntry 11 }

   natSubscriberMappingCreations OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mappings created by or for this subscriber."
       ::= { natSubscribersTableEntry 12 }

   natSubscriberMappingRemovals OBJECT-TYPE
       SYNTAX Counter64
       MAX-ACCESS read-only
       STATUS current
       DESCRIPTION
           "Number of mappings removed by or for this subscriber."
       ::= { natSubscribersTableEntry 13 }

   natSubscriberLimitMappings OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "Limit on the number of active mappings created by or for
            this subscriber. Zero means unlimited."
       ::= { natSubscribersTableEntry 14 }




Perreault, et al.        Expires March 31, 2014                [Page 73]


Internet-Draft                   NAT MIB                  September 2013


   natSubscriberMapNotifyThresh OBJECT-TYPE
       SYNTAX Unsigned32
       MAX-ACCESS read-write
       STATUS current
       DESCRIPTION
           "See natNotifSubscriberMappings."
       ::= { natSubscribersTableEntry 15 }


   -- object groups

   natGroupBasicObjects OBJECT-GROUP
       OBJECTS { natTranslations,
                 natOutOfPortErrors,
                 natResourceErrors,
                 natQuotaDrops,
                 natMappingCreations,
                 natMappingRemovals,
                 natL4ProtocolTranslations ,
                 natL4ProtocolOutOfPortErrors,
                 natL4ProtocolResourceErrors,
                 natL4ProtocolQuotaDrops,
                 natL4ProtocolMappingCreations,
                 natL4ProtocolMappingRemovals,
                 natLimitMappings,
                 natMappingsNotifyThreshold,
                 natPoolIndex,
                 natPoolRealm,
                 natPoolUsage,
                 natPoolWatermarkLow,
                 natPoolWatermarkHigh,
                 natPoolPortMin,
                 natPoolPortMax,
                 natPoolRangePoolIndex,
                 natPoolRangeEnd,
                 natPoolRangeAllocatedPorts,
                 natMappingIntRealm,
                 natMappingIntAddressType,
                 natMappingIntAddress,
                 natMappingIntPort,
                 natMappingPool,
                 natMappingMapBehavior,
                 natMappingFilterBehavior,
                 natMappingAddressPooling }
       STATUS current
       DESCRIPTION
           "Basic counters, limits, and thresholds."
       ::= { natMIBGroups 7 }



Perreault, et al.        Expires March 31, 2014                [Page 74]


Internet-Draft                   NAT MIB                  September 2013


   natGroupAddrMapObjects OBJECT-GROUP
       OBJECTS { natAddressMappingCreations,
                 natAddressMappingRemovals,
                 natLimitAddressMappings,
                 natAddrMapNotifyThreshold,
                 natMapIntAddrExtRealm,
                 natMapIntAddrExt }
       STATUS current
       DESCRIPTION
           "Objects that require 'Paired IP address pooling' behavior
            [RFC4787]."
       ::= { natMIBGroups 8 }

   natGroupFragmentObjects OBJECT-GROUP
       OBJECTS { natLimitFragments }
       STATUS current
       DESCRIPTION
           "Objects that require 'Receive Fragments Out of Order'
            behavior [RFC4787]."
       ::= { natMIBGroups 9 }

   natGroupBasicNotifications NOTIFICATION-GROUP
       NOTIFICATIONS { natNotifPoolWatermarkLow,
                       natNotifPoolWatermarkHigh,
                       natNotifMappings }
       STATUS current
       DESCRIPTION
           "Basic notifications."
       ::= { natMIBGroups 11 }

   natGroupAddrMapNotifications NOTIFICATION-GROUP
       NOTIFICATIONS { natNotifAddrMappings }
       STATUS current
       DESCRIPTION
           "Notifications about address mappings."
       ::= { natMIBGroups 12 }

   natGroupSubscriberObjects OBJECT-GROUP
       OBJECTS { natSubscriberIntPrefixType,
                 natSubscriberIntPrefix,
                 natSubscriberIntPrefixLength,
                 natSubscriberRealm,
                 natSubscriberPool,
                 natSubscriberTranslations,
                 natSubscriberOutOfPortErrors,
                 natSubscriberResourceErrors,
                 natSubscriberQuotaDrops,
                 natSubscriberMappingCreations,



Perreault, et al.        Expires March 31, 2014                [Page 75]


Internet-Draft                   NAT MIB                  September 2013


                 natSubscriberMappingRemovals,
                 natSubscriberLimitMappings,
                 natLimitSubscribers,
                 natSubscriberMapNotifyThresh }
       STATUS current
       DESCRIPTION
           "Per-subscriber counters, limits, and thresholds."
       ::= { natMIBGroups 13 }

   natGroupSubscriberNotifications NOTIFICATION-GROUP
       NOTIFICATIONS { natNotifSubscriberMappings }
       STATUS current
       DESCRIPTION
           "Subscriber notifications."
       ::= { natMIBGroups 14 }


   -- compliance statements

   natBasicCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
           "Basic compliance with this MIB is attained when the objects
            contained in the mandatory groups are implemented."
       MODULE  -- this module
           MANDATORY-GROUPS { natGroupBasicObjects,
                              natGroupBasicNotifications }
       ::= { natMIBCompliances 3 }

   natAddrMapCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
           "NATs that have 'Paired IP address pooling' behavior
            [RFC4787] and implement the objects in this group can claim
            this level of compliance."
       MODULE  -- this module
           MANDATORY-GROUPS { natGroupBasicObjects,
                              natGroupBasicNotifications,
                              natGroupAddrMapObjects,
                              natGroupAddrMapNotifications }
       ::= { natMIBCompliances 4 }

   natFragmentsCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
           "NATs that have 'Receive Fragments Out of Order' behavior
            [RFC4787] and implement the objects in this group can claim
            this level of compliance."



Perreault, et al.        Expires March 31, 2014                [Page 76]


Internet-Draft                   NAT MIB                  September 2013


       MODULE  -- this module
           MANDATORY-GROUPS { natGroupBasicObjects,
                              natGroupBasicNotifications,
                              natGroupFragmentObjects }
       ::= { natMIBCompliances 5 }

   natCGNCompliance MODULE-COMPLIANCE
       STATUS current
       DESCRIPTION
           "NATs that have 'Paired IP address pooling' and 'Receive
            Fragments Out of Order' behavior [RFC4787] and implement the
            objects in this group can claim this level of compliance.

            This level of compliance is to be expected of a CGN
            compliant with [RFC6888]."
       MODULE  -- this module
           MANDATORY-GROUPS { natGroupBasicObjects,
                              natGroupBasicNotifications,
                              natGroupAddrMapObjects,
                              natGroupAddrMapNotifications,
                              natGroupFragmentObjects,
                              natGroupSubscriberObjects,
                              natGroupSubscriberNotifications }
       ::= { natMIBCompliances 6 }


   END


5.  Security Considerations

   There are a number of management objects defined in this MIB module
   with a MAX-ACCESS clause of read-write and/or read-create.  Such
   objects may be considered sensitive or vulnerable in some network
   environments.  The support for SET operations in a non-secure
   environment without proper protection can have a negative effect on
   network operations.  These are the tables and objects and their
   sensitivity/vulnerability:

   Limits:  An attacker setting a very low or very high limit can easily
      cause a denial-of-service situation.

      *  natLimitMappings

      *  natLimitAddressMappings

      *  natLimitFragments




Perreault, et al.        Expires March 31, 2014                [Page 77]


Internet-Draft                   NAT MIB                  September 2013


      *  natLimitSubscribers

      *  natSubscriberLimitMappings

   Notification thresholds:  An attacker setting an arbitrarily low
      treshold can cause many useless notifications to be generated.
      Setting an arbitrarily high threshold can effectively disable
      notifications, which could be used to hide another attack.

      *  natMappingsNotifyThreshold

      *  natAddrMapNotifyThreshold

      *  natSubscriberMapNotifyThresh

   Some of the readable objects in this MIB module (i.e., objects with a
   MAX-ACCESS other than not-accessible) may be considered sensitive or
   vulnerable in some network environments.  It is thus important to
   control even GET and/or NOTIFY access to these objects and possibly
   to even encrypt the values of these objects when sending them over
   the network via SNMP.  These are the tables and objects and their
   sensitivity/vulnerability:

   Objects that reveal host identities:  Various objects can reveal the
      identity of private hosts that are engaged in a session with
      external end nodes.  A curious outsider could monitor these to
      assess the number of private hosts being supported by the NAT
      device.  Further, a disgruntled former employee of an enterprise
      could use the information to break into specific private hosts by
      intercepting the existing sessions or originating new sessions
      into the host.

      *  natMapIntAddrType

      *  natMapIntAddrInt

      *  natMapIntAddrExt

      *  natMappingIntRealm

      *  natMappingIntAddressType

      *  natMappingIntAddress

      *  natMappingIntPort

      *  natMappingMapBehavior




Perreault, et al.        Expires March 31, 2014                [Page 78]


Internet-Draft                   NAT MIB                  September 2013


      *  natMappingFilterBehavior

      *  natMappingAddressPooling

      *  natSubscriberIntPrefixType

      *  natSubscriberIntPrefix

      *  natSubscriberIntPrefixLength

   Other objects that reveal NAT state:  Other managed objects in this
      MIB may contain information that may be sensitive from a business
      perspective, in that they may represent NAT state information.

      *  natCntAddressMappings

      *  natCntProtocolMappings

      *  natPoolUsage

      *  natPoolRangeAllocatedPorts

      *  natSubscriberCntMappings

   There are no objects that are sensitive in their own right, such as
   passwords or monetary amounts.

   SNMP versions prior to SNMPv3 did not include adequate security.
   Even if the network itself is secure (for example by using IPsec),
   there is no control as to who on the secure network is allowed to
   access and GET/SET (read/change/create/delete) the objects in this
   MIB module.

   Implementations SHOULD provide the security features described by the
   SNMPv3 framework (see [RFC3410]), and implementations claiming
   compliance to the SNMPv3 standard MUST include full support for
   authentication and privacy via the User-based Security Model (USM)
   [RFC3414] with the AES cipher algorithm [RFC3826].  Implementations
   MAY also provide support for the Transport Security Model (TSM)
   [RFC5591] in combination with a secure transport such as SSH
   [RFC5592] or TLS/DTLS [RFC6353].










Perreault, et al.        Expires March 31, 2014                [Page 79]


Internet-Draft                   NAT MIB                  September 2013


   Further, deployment of SNMP versions prior to SNMPv3 is NOT
   RECOMMENDED.  Instead, it is RECOMMENDED to deploy SNMPv3 and to
   enable cryptographic security.  It is then a customer/operator
   responsibility to ensure that the SNMP entity giving access to an
   instance of this MIB module is properly configured to give access to
   the objects only to those principals (users) that have legitimate
   rights to indeed GET or SET (change/create/delete) them.

6.  IANA Considerations

   IANA has assigned object identifier 123 to the natMIB module, with
   prefix iso.org.dod.internet.mgmt.mib-2 in the Network Management
   Parameters registry [SMI-NUMBERS].

   No IANA actions are required by this document.

7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Textual Conventions for SMIv2", STD
              58, RFC 2579, April 1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.

   [RFC3414]  Blumenthal, U. and B. Wijnen, "User-based Security Model
              (USM) for version 3 of the Simple Network Management
              Protocol (SNMPv3)", STD 62, RFC 3414, December 2002.

   [RFC3826]  Blumenthal, U., Maino, F., and K. McCloghrie, "The
              Advanced Encryption Standard (AES) Cipher Algorithm in the
              SNMP User-based Security Model", RFC 3826, June 2004.

   [RFC4001]  Daniele, M., Haberman, B., Routhier, S., and J.
              Schoenwaelder, "Textual Conventions for Internet Network
              Addresses", RFC 4001, February 2005.





Perreault, et al.        Expires March 31, 2014                [Page 80]


Internet-Draft                   NAT MIB                  September 2013


   [RFC4750]  Joyal, D., Galecki, P., Giacalone, S., Coltun, R., and F.
              Baker, "OSPF Version 2 Management Information Base", RFC
              4750, December 2006.

   [RFC4787]  Audet, F. and C. Jennings, "Network Address Translation
              (NAT) Behavioral Requirements for Unicast UDP", BCP 127,
              RFC 4787, January 2007.

   [RFC5591]  Harrington, D. and W. Hardaker, "Transport Security Model
              for the Simple Network Management Protocol (SNMP)", RFC
              5591, June 2009.

   [RFC5592]  Harrington, D., Salowey, J., and W. Hardaker, "Secure
              Shell Transport Model for the Simple Network Management
              Protocol (SNMP)", RFC 5592, June 2009.

   [RFC6353]  Hardaker, W., "Transport Layer Security (TLS) Transport
              Model for the Simple Network Management Protocol (SNMP)",
              RFC 6353, July 2011.

7.2.  Informative References

   [RFC2663]  Srisuresh, P. and M. Holdrege, "IP Network Address
              Translator (NAT) Terminology and Considerations", RFC
              2663, August 1999.

   [RFC3022]  Srisuresh, P. and K. Egevang, "Traditional IP Network
              Address Translator (Traditional NAT)", RFC 3022, January
              2001.

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.

   [RFC4008]  Rohit, R., Srisuresh, P., Raghunarayan, R., Pai, N., and
              C. Wang, "Definitions of Managed Objects for Network
              Address Translators (NAT)", RFC 4008, March 2005.

   [RFC6333]  Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual-
              Stack Lite Broadband Deployments Following IPv4
              Exhaustion", RFC 6333, August 2011.

   [RFC6888]  Perreault, S., Yamagata, I., Miyakawa, S., Nakagawa, A.,
              and H. Ashida, "Common Requirements for Carrier-Grade NATs
              (CGNs)", BCP 127, RFC 6888, April 2013.

   [SMI-NUMBERS]




Perreault, et al.        Expires March 31, 2014                [Page 81]


Internet-Draft                   NAT MIB                  September 2013


              , "Network Management Parameters registry at IANA", ,
              <http://www.iana.org/assignments/smi-numbers>.

Authors' Addresses

   Simon Perreault
   Viagenie
   246 Aberdeen
   Quebec, QC  G1R 2E1
   Canada

   Phone: +1 418 656 9254
   Email: simon.perreault@viagenie.ca
   URI:   http://viagenie.ca


   Tina Tsou
   Huawei Technologies (USA)
   2330 Central Expressway
   Santa Clara, CA  95050
   USA

   Phone: +1 408 330 4424
   Email: tina.tsou.zouting@huawei.com


   Senthil Sivakumar
   Cisco Systems
   7100-8 Kit Creek Road
   Research Triangle Park, North Carolina  27709
   USA

   Phone: +1 919 392 5158
   Email: ssenthil@cisco.com

















Perreault, et al.        Expires March 31, 2014                [Page 82]


Html markup produced by rfcmarkup 1.129b, available from https://tools.ietf.org/tools/rfcmarkup/