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NAT Working Group                                       R. Raghunarayan
INTERNET-DRAFT                                                   N. Pai
Expires April 2004                                  Cisco Systems, Inc.
                                                               R. Rohit
                                                  Mascon Global Limited
                                                                C. Wang
                                                          Bank One Corp
                                                           P. Srisuresh
                                                   Caymas Systems, Inc.
                                                           October 2003


  Definitions of Managed Objects for Network Address Translators (NAT)

                     <draft-ietf-nat-natmib-07.txt>

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.


Copyright Notice

   Copyright (C), 2003, The Internet Society.  All Rights Reserved.

Abstract

   This memo defines an SMIv2 Management Information Base (MIB) for
   a device implementing NAT function. This MIB may be used for
   configuration as well as monitoring of a device capable of
   NAT function.



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Table of Contents

   1  Introduction ..................................................2
   2  The Internet-Standard Management Framework ....................2
   3  Terminology ...................................................2
   4  Overview ......................................................3
   4.1 Relation between the NAT configuration tables.................4
   4.2 Relation between the translation and the configuration tables.4
   4.3 Configuration via the MIB.....................................5
   4.4 Relationship to Interface MIB.................................6
   5  Definitions ...................................................6
   6  Intellectual Property.........................................52
   7  Change History................................................53
   8  Acknowledgements .............................................54
   10 Security Considerations ......................................55
   11 References ...................................................56
   12 Author's Addresses ...........................................57
   13 Full Copyright Statement......................................58


1.  Introduction

   This memo defines an SMIv2 Management Information Base (MIB) for
   a device implementing NAT [RFC3022] function. This may be used
   for configuration as well as monitoring of a device capable
   of NAT function.

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
   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.  Terminology

   The terminology used throughout this document is mostly as per RFC
   2663 [RFC2663]. Definition for the term "Symmetric NAT" may be found
   in RFC 3489 [RFC3489]. Symmetric NAT is a variation of NAPT in that
   a address-port bind is not retained across multiple sessions from


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   the same private source port. The term "NAT session" is used
   extensively in the document and may be defined as follows.

   NAT Session - A NAT session is an association between a session
   as seen in the private realm and a session as seen in the public
   realm, by virtue of NAT translation. If a session in the private
   realm were to be represented as (PrivateSrcAddr, PrivateDstAddr,
   TransportProtocol, PrivateSrcPort, PrivateDstPort) and  the
   same session in the public realm were to be represented as
   (PublicSrcAddr, PublicDstAddr, TransportProtocol, PublicSrcPort,
   PublicDstPort), the NAT session will provide the translation
   glue between the two session representations.

   The term NAT has been used, throughout the document, to represent
   traditional NAT. In cases, where necessary, NAPT and Basic NAT will
   be used to represent port translation and address translation
   respectively.

   The terms public and private are used throughout the document in
   the context of networks, while the terms local and global are used
   when referring to addresses and ports.

4.  Overview

   The NAT MIB module for some parts depends on the IF-MIB [RFC2863].
   The MIB module is split into three groups as follows.

   o the configuration group,
   o the translation group, and
   o the statistics group.

   The configuration group consists of two tables and seven scalars:

   o natConfInterfaceTable - the interface specific configuration
     table, which specifies the NAT config parameters for a specific
     interface.
   o natConfAddrMapTable - the address map table, which is an
     extension of the per-interface configuration table, and specifies
     information required to setup static/dynamic address and ports
     maps.
   o five protocol specific scalars, specifying the bind timeout
     values for the more common protocols, TCP, UDP and ICMP, and a
     generic timeout value that can be used for all other protocols.

   The translation group, monitoring the dynamic activities of the NAT
   device, consists of two scalars and three tables:

   o the scalars, natAddrBindNumberOfEntries and
     natAddrPortBindNumberOfEntries, hold the number of entries



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     that currently exist in the Address bind and the Address-Port
     bind tables respectively.
   o natAddrBindTable - the Address bind table, which holds the
     currently active address bindings.
   o natAddrPortBindTable - the Address-Port bind table, which
     holds the currently active transport bindings.
   o natSessionTable - the session table, holds information regarding
     active NAT sessions.

   And finally, the statistics group consists of three tables:

   o natStatsProtocolTable - the Protocol stats table, indicating
     translation statistics per protocol.
   o natStatsAddrMapTable - the Address Map stats table, indicating
     translation statistics per address map.
   o natStatsInterfaceTable - the Interface stats table, indicating
     translation statistics per interface.

   There is also one notification defined in the MIB:

   o natPacketDiscard notifies the end user/manager of
     packets being discarded due to lack of address mappings.

4.1 Relation between the NAT configuration tables

   The association between the various configuration tables can be
   represented as follows:


     per interface config   (global config parameters)
        |                            |
        |                            |
        |                            |
        |----------------------------|
        |
        |
     address map

   Every interface NAT config is associated with a set of global
   (TCP, UDP and ICMP) config parameters, represented by the five
   protocol specific scalars.


4.2 Relation between the translation and the configuration tables

   The association between the configuration and the translation
   tables can be represented as follows.





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                        Address map
                             |
                             |
                             |
        ----------------------------------------------
       |                                              |
       |                                              |
       |                                              |
   Address Bind                                Address Port Bind
       |                                              |
       |                                              |
       |                                              |
        ----------------------------------------------
                             |
                             |
                             |
                          Session

   Every bind, address as well as address-port bind, is derived
   from an address map. The ifIndex inconjunction with the
   natAddrBindMapIndex or natAddrPortBindMapIndex object
   provide the linkage between the bind and the address map it
   has been derived from.

   On the other hand, every NAT session is derived from a bind,
   address or address-port bind. The
   natSessionPrivateSrcEPBindId and the
   natSessionPrivateDstEPBindId objects represent this linkage.

4.3 Configuration via the MIB

   Entries in the Address Bind and Address-Port Bind Tables are
   derived from the address map table. Entries must, therefore,
   not exist in the Address Bind or a Address-Port Bind Entry
   without an associated entry in the Address Map table.

   Likewise, the session entries are derived from the Binds and
   an entry must not exist in the Session table (except in the case
   of Symmetric NAT) corresponding Bind table entry.
   Before deleting a bind entry, all the session entries corresponding
   to the bind entry must be deleted.

   A Management station may use the following steps to configure
   entries in the NAT-MIB:

   -  Create an address map entry in the natConfAddrMapTable,





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   -  Create an entry in the natConfInterfaceTable specifying the
      the value of ifIndex as the interface index of the interface
      on which NAT is being configured.
      Set natConfAddrMapConfigName to the name of the address map
      entry already created.
      Specify appropriate values, as applicable, for the other
      objects e.g. natConfInterfaceRealm, natConfServiceType, in the
      table.

   -  To configure NAT for TCP, UDP and ICMP protocols, the
      management station can set the protocol specific scalars.

   -  The Address Bind and Address-Port Bind Table will have the
      entries created due to this NAT configuration. A Management
      Station may also, if deemed necessary, create Address Bind
      or a Address-Port Bind entry and link those entries to the
      appropriate address map configured.

4.4  Relationship to Interface MIB

   The natConfInterfaceTable specifies the NAT configuration attributes
   on each interface. The concept of "interface" is as defined by
   InterfaceIndex/ifIndex of the IETF Interfaces MIB [IF-MIB].

5.  Definitions

NAT-MIB DEFINITIONS ::= BEGIN

IMPORTS
     MODULE-IDENTITY,
     OBJECT-TYPE,
     Unsigned32,
     Gauge32,
     Counter64,
     TimeTicks,
     mib-2,
     NOTIFICATION-TYPE
             FROM SNMPv2-SMI
     TimeInterval,
     TEXTUAL-CONVENTION
             FROM SNMPv2-TC
     MODULE-COMPLIANCE,
     NOTIFICATION-GROUP,
     OBJECT-GROUP
             FROM SNMPv2-CONF
     StorageType,
     RowStatus
             FROM SNMPv2-TC




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     ifIndex
             FROM IF-MIB
     SnmpAdminString
             FROM SNMP-FRAMEWORK-MIB
     InetAddressType,
     InetAddress,
     InetPortNumber
             FROM INET-ADDRESS-MIB;

natMIB MODULE-IDENTITY
     LAST-UPDATED "200310070000Z"
     ORGANIZATION "IETF MIDCOM Working Group"
     CONTACT-INFO
             " Rohit
               Mascon Global Limted
               #59/2 100 ft Ring Road
               Banashankari II Stage
               Bangalore 560 070
               India
               Phone: +91 80 679 6227
               Email: rrohit74@hotmail.com

               Nalinaksh Pai
               Cisco Systems, Inc.
               Prestige Waterford
               No. 9, Brunton Road
               Bangalore - 560 025
               India
               Phone: +91 80 532 1300
               Email: npai@cisco.com

               Rajiv Raghunarayan
               Cisco Systems Inc.
               170 West Tasman Drive
               San Jose, CA 95134
               Phone: +1 408 853 9612
               Email: raraghun@cisco.com

               Cliff Wang
               Information Security
               Bank One Corp
               1111 Polaris Pkwy
               Columbus, OH 43240
               Phone: +1 614 213 6117
               Email: cliffwang2000@yahoo.com







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               P. Srisuresh
               Caymas Systems, Inc.
               1179-A North McDowell Blvd.
               Petaluma, CA 94954
               Tel: (707) 283-5063
               Email: srisuresh@yahoo.com

               Middlebox Communication Working Group:
               midcom@ietf.org
             "
     DESCRIPTION
             "This MIB module defines the generic managed objects
              for NAT."
     REVISION     "200310070000Z"  -- 7th Oct. 2003
     DESCRIPTION
             "This revision addressed comments raised by the
              MIDCOM Working Group."
     REVISION     "200308200000Z"  -- 20th Aug. 2003
     DESCRIPTION
             "This revision removed the protocol extensibility
              and correct the naming inconsistency."
     REVISION     "200211030000Z"  -- 3rd Nov. 2002
     DESCRIPTION
             "This revision addresses the comments raised by the
              MIDCOM Working Group."
     REVISION     "200206140000Z"  -- 14th June 2002
     DESCRIPTION
             "This MIB module addresses the smilint warnings found
              in the IETF MIB Module Validation."
     REVISION     "200202070000Z"  -- 7th Feb. 2002
     DESCRIPTION
             "Merged the Config and Interface specific Tables.
              Added the ability for the Management Station to
              create/destroy NAT address binds and sessions."
     REVISION     "200111090000Z"  -- 9th Nov. 2001
     DESCRIPTION
             "Merged the Static and Dynamic addr Tables.
              Protocol specific extensibility added."
     REVISION     "200109100000Z"  -- 10th Sep. 2001
     DESCRIPTION
             "Notifications added."
     REVISION     "200103010000Z"  -- 1st Mar. 2001
     DESCRIPTION
             "Initial version, published as RFC yyyy."
     -- RFC Ed.: replace yyyy with actual RFC number & remove this note

     ::= { mib-2 XXX } -- RFC Ed.: replace XXX with IANA-assigned
                       -- number & remove this note




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natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 }

--
-- The Groups
-- o natConfig - Pertaining to NAT configuration information
-- o natTranslation - Pertaining to the NAT BINDs/sessions.
-- o natStatistics - NAT statistics, other than those maintained
--                   by the Bind and Session tables.
--

natConfig OBJECT IDENTIFIER ::= { natMIBObjects 1 }
natTranslation OBJECT IDENTIFIER ::= { natMIBObjects 2 }
natStatistics OBJECT IDENTIFIER ::= { natMIBObjects 3 }


NATProtocolType ::= TEXTUAL-CONVENTION
       STATUS       current
       DESCRIPTION
               "A list of protocols that support
                the network address translation. Inclusion of
                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       current
       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)
                }





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

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


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


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


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


NatBindType ::= TEXTUAL-CONVENTION
       STATUS current
       DESCRIPTION
               "An indication whether the bind is
                static or dynamic."




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

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

--
-- UDP related NAT configuration
--

natConfUdpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Unsigned32  (1..4294967295)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default UDP idle timeout parameter."
    DEFVAL { 300 }
    ::= { natConfig 1 }

--
-- ICMP related NAT configuration
--

natConfIcmpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Unsigned32  (1..4294967295)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default ICMP idle timeout parameter."
    DEFVAL { 300 }
    ::= { natConfig 2 }





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--
-- Other protocol parameters
--

natConfOtherDefIdleTimeout OBJECT-TYPE
    SYNTAX     Unsigned32  (1..4294967295)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default idle timeout parameter for protocols
             represented by the value other (2) in
             NATProtocolType."
    DEFVAL { 60 }
    ::= { natConfig 3 }

--
-- TCP related NAT configuration
--

natConfTcpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Unsigned32  (1..4294967295)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default time interval a NAT session for an
             established TCP connection is allowed to remain
             valid without any activity on the TCP connection."
    DEFVAL { 86400 }
    ::= { natConfig 4 }

natConfTcpDefNegTimeout OBJECT-TYPE
    SYNTAX     Unsigned32  (1..4294967295)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default time interval a NAT session for a TCP
             connection which is not in the established state
             is allowed to remain valid without any activity on
             the TCP connection."
    DEFVAL { 60 }
    ::= { natConfig 5 }








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--
-- The Configuration Group
--

natConfInterfaceTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF NatConfInterfaceEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table specifies the configuration attributes for a
             device supporting NAT function."
    ::= { natConfig 6 }


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

             When natConfStorageType 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 }
    ::= { natConfInterfaceTable 1 }

NatConfInterfaceEntry ::= SEQUENCE {
    natConfInterfaceRealm       INTEGER,
    natConfServiceType          BITS,
    natConfAddrMapConfigName    SnmpAdminString,
    natConfStorageType          StorageType,
    natConfRowStatus            RowStatus
}

natConfInterfaceRealm OBJECT-TYPE
    SYNTAX     INTEGER {
                   private (1),
                   public (2)
               }
    MAX-ACCESS read-create
    STATUS     current




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    DESCRIPTION
            "This object identifies whether this interface is
             connected to the private or the public realm."
    DEFVAL     { public }
    ::= { natConfInterfaceEntry 1 }

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

natConfAddrMapConfigName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object selects a set of address maps defined in
             the natConfAddrMapTable.The selected set of addr maps
             are defined by entries in the natConfAddrMapTable whose
             index value (natConfAddrMapName) is equal to this object.
             An address map must not be reused across different
             interfaces. Address map entries contain addresses
             specific to an interface."
    ::= { natConfInterfaceEntry 3 }

natConfStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    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 }
    ::= { natConfInterfaceEntry 4 }




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

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

             In particular, a newly created row cannot be made
             active until the corresponding instances of
             natConfServiceType and natConfAddrMapConfigName
             have 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."
    ::= { natConfInterfaceEntry 5 }

--
-- The Address Map Table
--

natConfAddrMapTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF NatConfAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table lists address map configuration for NAT."
    ::= { natConfig 7 }

natConfAddrMapEntry OBJECT-TYPE
    SYNTAX      NatConfAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    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   { natConfAddrMapName, natConfAddrMapIndex }
    ::= { natConfAddrMapTable 1 }

NatConfAddrMapEntry ::= SEQUENCE {
    natConfAddrMapName                SnmpAdminString,
    natConfAddrMapIndex               NatAddrMapId,



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    natConfAddrMapEntryType           INTEGER,
    natConfAddrMapTranslationEntity   NatTranslationEntity,
    natConfLocalAddrType              InetAddressType,
    natConfLocalAddrFrom              InetAddress,
    natConfLocalAddrTo                InetAddress,
    natConfLocalPortFrom              InetPortNumber,
    natConfLocalPortTo                InetPortNumber,
    natConfGlobalAddrType             InetAddressType,
    natConfGlobalAddrFrom             InetAddress,
    natConfGlobalAddrTo               InetAddress,
    natConfGlobalPortFrom             InetPortNumber,
    natConfGlobalPortTo               InetPortNumber,
    natConfProtocol                   BITS,
    natConfAddrMapStorageType         StorageType,
    natConfAddrMapRowStatus           RowStatus
}

natConfAddrMapName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "Name identifying a set of entries in this table.
             The combination of natConfAddrMapName and
             natConfAddrMapIndex uniquely identifies
             an entry in this table."
    ::= { natConfAddrMapEntry 1 }

natConfAddrMapIndex  OBJECT-TYPE
    SYNTAX      NatAddrMapId
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "Along with natConfAddrMapName, this object uniquely
             identifies an entry in the natConfAddrMapTable.
             Address map entries are applied in the order
             specified by natConfAddrMapIndex."
    ::= { natConfAddrMapEntry 2 }

natConfAddrMapEntryType OBJECT-TYPE
    SYNTAX  INTEGER {
                static (1),
                dynamic (2)
            }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This config parameter can be used to set up static
             or dynamic address maps."
    ::= { natConfAddrMapEntry 3 }


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natConfAddrMapTranslationEntity OBJECT-TYPE
    SYNTAX      NatTranslationEntity
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The end-point entity (Source or desitnation) 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 map 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 map for Basic NAT and NAPT were
             to be configured on a private interface, the desired
             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."
    ::= { natConfAddrMapEntry 4 }


natConfLocalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natConfLocalAddrFrom and natConfLocalAddrTo."
    ::= { natConfAddrMapEntry 5 }

natConfLocalAddrFrom OBJECT-TYPE
    SYNTAX      InetAddress (SIZE (0..20))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the first IP address of the range
             of IP addresses mapped by this translation entry."


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    ::= { natConfAddrMapEntry 6 }

natConfLocalAddrTo OBJECT-TYPE
    SYNTAX      InetAddress (SIZE (0..20))
    MAX-ACCESS  read-create
    STATUS      current
    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 natConfLocalAddrFrom. For a
             static NAT, the number of addresses in the range defined
             by natConfLocalAddrFrom and natConfLocalAddrTo must be
             equal to the number of addresses in the range defined by
             natConfGlobalAddrFrom and natConfGlobalAddrTo."
    ::= { natConfAddrMapEntry 7 }

natConfLocalPortFrom OBJECT-TYPE
    SYNTAX      InetPortNumber
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object must be 0. If
             this conceptual row describes NAPT, then the value of
             this object specifies the first port number in the range
             of ports being mapped.

             If the translation specifies a single port, then
             the value of this object is equal to the value of
             natConfLocalPortTo."
    ::= { natConfAddrMapEntry 8 }

natConfLocalPortTo OBJECT-TYPE
    SYNTAX      InetPortNumber
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object must be 0. If
             this conceptual row describes NAPT, then the value of
             this object specifies the last port number in the range
             of ports being mapped.

             If the translation specifies a single port, then the
             value of this object is equal to the value of
             natConfLocalPortFrom."
    ::= { natConfAddrMapEntry 9 }




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natConfGlobalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natConfGlobalAddrFrom and natConfGlobalAddrTo."
    ::= { natConfAddrMapEntry 10 }

natConfGlobalAddrFrom OBJECT-TYPE
    SYNTAX      InetAddress (SIZE (0..20))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the first IP address of the range of
             IP addresses being mapped to."
    ::= { natConfAddrMapEntry 11 }

natConfGlobalAddrTo OBJECT-TYPE
    SYNTAX      InetAddress (SIZE (0..20))
    MAX-ACCESS  read-create
    STATUS      current
    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 natConfGlobalAddrFrom. For a static NAT, the
             number of addresses in the range defined by
             natConfGlobalAddrFrom and natConfGlobalAddrTo must be
             equal to the number of addresses in the range defined by
             natConfLocalAddrFrom and natConfLocalAddrTo."
    ::= { natConfAddrMapEntry 12 }

natConfGlobalPortFrom OBJECT-TYPE
    SYNTAX      InetPortNumber
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object must be 0. If
             this conceptual row describes NAPT, then the value of
             this object specifies the first port number in the range
             of ports being mapped to. If the translation specifies a
             single port, then the value of this object is equal to
             the value natConfGlobalPortTo."
    ::= { natConfAddrMapEntry 13 }






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natConfGlobalPortTo OBJECT-TYPE
    SYNTAX      InetPortNumber
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object must be 0. 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. If the translation specifies a
             single port, then the value of this object is equal to
             the value of natConfGlobalPortFrom."
    ::= { natConfAddrMapEntry 14 }

natConfProtocol OBJECT-TYPE
    SYNTAX      NATProtocolMap
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies a bitmap of protocol identifiers."
    ::= { natConfAddrMapEntry 15 }

natConfAddrMapStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    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 }
    ::= { natConfAddrMapEntry 16 }

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

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

             None of the objects in this row may be modified
             while the value of this object is active(1)."


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    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    ::= { natConfAddrMapEntry 17 }

--
-- The Translation Group
--

--
-- Address Bind section
--

natAddrBindNumberOfEntries OBJECT-TYPE
    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object maintains a count of the number of entries
             that currently exist in the natAddrBindTable."
    ::= { natTranslation 1 }

--
-- The NAT Address BIND Table
--

natAddrBindTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatAddrBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This table holds information about the currently
             active NAT BINDs."
    ::= { natTranslation 2 }

natAddrBindEntry OBJECT-TYPE
    SYNTAX     NatAddrBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in this table holds information about
             an active address BIND. These entries are lost
             upon agent restart."
    INDEX   { ifIndex, natAddrBindLocalAddrType, natAddrBindLocalAddr }
    ::= { natAddrBindTable 1 }

NatAddrBindEntry ::= SEQUENCE {
    natAddrBindLocalAddrType        InetAddressType,
    natAddrBindLocalAddr            InetAddress,
    natAddrBindGlobalAddrType       InetAddressType,



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    natAddrBindGlobalAddr           InetAddress,
    natAddrBindId                   NatBindId,
    natAddrBindTranslationEntity    NatTranslationEntity,
    natAddrBindType                 NatBindType,
    natAddrBindMapIndex             NatAddrMapId,
    natAddrBindSessionCount         Gauge32,
    natAddrBindMaxIdleTime          TimeInterval,
    natAddrBindCurrentIdleTime      TimeTicks,
    natAddrBindInTranslates         Counter64,
    natAddrBindOutTranslates        Counter64,
    natAddrBindRowStatus            RowStatus
}

natAddrBindLocalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natAddrBindLocalAddr."
    ::= { natAddrBindEntry 1 }

natAddrBindLocalAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This object represents the private-realm specific network
             layer address, which maps to the public-realm address
             represented by natAddrBindGlobalAddr."
    ::= { natAddrBindEntry 2 }

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

natAddrBindGlobalAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the public-realm network layer
             address that maps to the private-realm network layer
             address represented by natAddrBindLocalAddr."
    ::= { natAddrBindEntry 4 }


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natAddrBindId OBJECT-TYPE
    SYNTAX     NatBindId
    MAX-ACCESS read-only
    STATUS     current
    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 bind id that is
             unique across both, the Address bind and the
             Address-Port bind tables."
    ::= { natAddrBindEntry 5 }

natAddrBindTranslationEntity OBJECT-TYPE
    SYNTAX     NatTranslationEntity
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the direction of sessions
             for which this bind is applicable and the entity
             (source or detination) 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 inboundDestEndPoint)."
    ::= { natAddrBindEntry 6 }

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

natAddrBindMapIndex OBJECT-TYPE
    SYNTAX     NatAddrMapId
    MAX-ACCESS read-create
    STATUS     current





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    DESCRIPTION
            "This object is a pointer to the natConfAddrMapTable entry
             (and the parameters of that entry) which was used in
             creating this BIND. This object, in conjuction with the
             ifIndex (which identifies a unique addrMapName) points to
             a unique entry in the natConfAddrMapTable. If the bind
             is being created by the Management Station, then it
             should set the value for this object to point to an
             existing address map entry. An attempt to set this object
             to a nonExistent address map entry will result in an
             inconsistentValue error."
    ::= { natAddrBindEntry 8 }

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

natAddrBindMaxIdleTime OBJECT-TYPE
    SYNTAX     TimeInterval
    MAX-ACCESS read-create
    STATUS     current
    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     current
    DESCRIPTION
            "At any given instance of time, this object indicates the
             time that this bind has been idle with no sessions
             attached to it.

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






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natAddrBindInTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were successfully
             translated using this bind entry."
    ::= { natAddrBindEntry 12 }

natAddrBindOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were successfully
             translated using this bind entry."
    ::= { natAddrBindEntry 13 }

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

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

             None of the writable objects except
             natAddrBindMaxIdleTime in this row may be modified
             while the value of this object is active(1)."
    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    ::= { natAddrBindEntry 14 }


--
-- Address-Port Bind section
--

natAddrPortBindNumberOfEntries OBJECT-TYPE
    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object maintains a count of the number of entries
             that currently exist in the natAddrPortBindTable."
    ::= { natTranslation 3 }


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

natAddrPortBindTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatAddrPortBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This table holds information about the currently
             active NAPT BINDs."
    ::= { natTranslation 4 }

natAddrPortBindEntry OBJECT-TYPE
    SYNTAX     NatAddrPortBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in the this table holds information
             about a NAPT bind that is currently active.
             These entries are lost upon agent restart."
    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                 NatBindType,
    natAddrPortBindMapIndex             NatAddrMapId,
    natAddrPortBindSessionCount         Gauge32,
    natAddrPortBindMaxIdleTime          TimeInterval,
    natAddrPortBindCurrentIdleTime      TimeTicks,
    natAddrPortBindInTranslates         Counter64,
    natAddrPortBindOutTranslates        Counter64,
    natAddrPortBindRowStatus            RowStatus
}






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

natAddrPortBindLocalAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS not-accessible
    STATUS     current
    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
             natAddrPortBindGlobalAddr and natAddrPortBindGlobalPort
             respectively."
    ::= { natAddrPortBindEntry 2 }

natAddrPortBindLocalPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This object represents the private-realm specific port
             number (or query identifier in case of ICMP echo, Timestamp
             and Information request messages, as defined in
             RFC 792[RFC792], to match replies with requests) which, in
             conjunction with natAddrPortBindLocalAddr, maps to the
             public-realm network layer address and transport id
             represented by natAddrPortBindGlobalAddr and
             natAddrPortBindGlobalPort respectively."
    ::= { natAddrPortBindEntry 3 }

natAddrPortBindProtocol OBJECT-TYPE
    SYNTAX      NATProtocolType
    MAX-ACCESS  not-accessible
    STATUS      current
    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 }




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natAddrPortBindGlobalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natAddrPortBindGlobalAddr."
    ::= { natAddrPortBindEntry 5 }

natAddrPortBindGlobalAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    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."
         ::= { natAddrPortBindEntry 6 }

natAddrPortBindGlobalPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the port number (or query
             identifier in case of ICMP messages, please refer
             to RFC 792 [RFC792]) that, in conjunction with
             natAddrPortBindGlobalAddr, maps to the private-realm
             network layer address and transport id represented by
             natAddrPortBindLocalAddr and natAddrPortBindLocalPort
             respectively."
    ::= { natAddrPortBindEntry 7 }

natAddrPortBindId OBJECT-TYPE
    SYNTAX     NatBindId
    MAX-ACCESS read-only
    STATUS     current
    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 Address Bind and Address-Port Bind tables."
    ::= { natAddrPortBindEntry 8 }






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natAddrPortBindTranslationEntity OBJECT-TYPE
    SYNTAX     NatTranslationEntity
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the direction of sessions
             for which this bind is applicable and the entity
             (source or detination) 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 inboundDestEndPoint)."
    ::= { natAddrPortBindEntry 9 }

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

natAddrPortBindMapIndex OBJECT-TYPE
    SYNTAX     NatAddrMapId
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object is a pointer to the natConfAddrMapTable entry
             (and the parameters of that entry) which was used in
             creating this BIND. This object, in conjuction with the
             ifIndex (which identifies a unique addrMapName) points to
             a unique entry in the natConfAddrMapTable. If the bind
             is being created by the Management Station, then it
             should set the value for this object to point to an
             existing address map entry. An attempt to set this object
             to a nonExistent address map entry will result in an
             inconsistentValue error."
    ::= { natAddrPortBindEntry 11 }





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

natAddrPortBindMaxIdleTime OBJECT-TYPE
    SYNTAX     TimeInterval
    MAX-ACCESS read-create
    STATUS     current
    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."
    ::= { natAddrPortBindEntry 13 }

natAddrPortBindCurrentIdleTime OBJECT-TYPE
    SYNTAX     TimeTicks
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "At any given instance of time, this object indicates the
             time that this bind has been idle with no 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     current
    DESCRIPTION
            "The number of inbound packets that were translated as per
             this bind entry."
    ::= { natAddrPortBindEntry 15 }

natAddrPortBindOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were translated as per
             this bind entry."
    ::= { natAddrPortBindEntry 16 }


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

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

             None of the writable objects except
             natAddrPortBindMaxIdleTime in this row may be
             modified while the value of this object is active(1)."
    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    ::= { natAddrPortBindEntry 17 }

--
-- The Session Table
--

natSessionTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatSessionEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The (conceptual) table containing one entry for each
             NAT session currently active on this NAT device."
    ::= { natTranslation 5 }

natSessionEntry OBJECT-TYPE
    SYNTAX     NatSessionEntry
    MAX-ACCESS not-accessible
    STATUS     current
    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,
    natSessionPrivateDstEPBindId           NatBindId,
    natSessionPrivateDstEPBindMode         NatBindMode,
    natSessionDirection                    INTEGER,


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    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                  TimeInterval,
    natSessionCurrentIdleTime              TimeTicks,
    natSessionInTranslates                 Counter64,
    natSessionOutTranslates                Counter64,
    natSessionRowStatus                    RowStatus
}

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


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

natSessionPrivateSrcEPBindMode OBJECT-TYPE
    SYNTAX     NatBindMode
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object indicates whether the bind indicated
             by the object natSessionPrivateSrcEPBindId
             is an address bind or an address-port bind."
    ::= { natSessionEntry 3 }




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

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

natSessionAddrMapIndex OBJECT-TYPE
    SYNTAX     NatAddrMapId
    MAX-ACCESS read-create
    STATUS     current




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    DESCRIPTION
            "This object is a pointer to the natConfAddrMapTable entry
             (and the parameters of that entry) which was used in
             creating this session. This object, in conjuction with the
             ifIndex (which identifies a unique addrMapName) points to
             a unique entry in the natConfAddrMapTable. If the session
             is being created by the Management Station, then it
             should set the value for this object to point to an
             existing address map entry. An attempt to set this object
             to a nonExistent address map entry will result in an
             inconsistentValue error."
    ::= { natSessionEntry 8 }

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

natSessionPrivateAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionPrivateAddr."
    ::= { natSessionEntry 10 }

natSessionPrivateSrcAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The source IP address of the session endpoint that
             lies in the private network."
    ::= { natSessionEntry 11 }

natSessionPrivateSrcPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The source transport port of the session endpoint that
             belongs to the private network. If this is an ICMP
             session then the value is the ICMP request ID [RFC792].
             The value of this object must be 0 when ports are not
             involved in the translation."
    ::= { natSessionEntry 12 }


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natSessionPrivateDstAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The destination IP address of the session endpoint that
             lies in the private network."
    ::= { natSessionEntry 13 }

natSessionPrivateDstPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The destination transport port of the session endpoint
             that belongs to the private network. If this is an ICMP
             session then the value is the ICMP request ID [RFC792].
             The value of this object must be 0 when ports are not
             involved in the translation."
    ::= { natSessionEntry 14 }

natSessionPublicAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionPublicAddr."
    ::= { natSessionEntry 15 }

natSessionPublicSrcAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The source IP address of the session endpoint that
             lies in the public network."
    ::= { natSessionEntry 16 }

natSessionPublicSrcPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The source transport port of the session endpoint that
             belongs to the public network. If this is an ICMP
             session then the value is the ICMP request ID [RFC792].
             The value of this object must be 0 when ports are not
             involved in the translation."
    ::= { natSessionEntry 17 }


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natSessionPublicDstAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The destination IP address of the session endpoint that
             lies in the public network."
    ::= { natSessionEntry 18 }

natSessionPublicDstPort OBJECT-TYPE
    SYNTAX     InetPortNumber
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The destination transport port of the session endpoint
             that belongs to the public network. If this is an ICMP
             session then the value is the ICMP request ID [RFC792].
             The value of this object must be 0 when ports are not
             involved in the translation."
    ::= { natSessionEntry 19 }

natSessionMaxIdleTime OBJECT-TYPE
    SYNTAX     TimeInterval
    MAX-ACCESS read-create
    STATUS     current
    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     current
    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     current
    DESCRIPTION
            "The number of inbound packets that were translated for
             this session."
    ::= { natSessionEntry 22 }





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natSessionOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were translated for
             this session."
    ::= { natSessionEntry 23 }

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

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

             None of the writable objects except
             natSessionMaxIdleTime in this row may be modified
             while the value of this object is active(1)."
    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    ::= { natSessionEntry 24 }

--
-- natStatistics Group
--

--
-- The Protocol Stats table
--

natStatsProtocolTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatStatsProtocolEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The (conceptual) table containing per protocol NAT
             statistics."
    ::= { natStatistics 1 }

natStatsProtocolEntry OBJECT-TYPE
    SYNTAX     NatStatsProtocolEntry
    MAX-ACCESS not-accessible
    STATUS     current



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    DESCRIPTION
            "An entry (conceptual row) containing NAT statistics
             pertaining to a particular protocol."
    INDEX   { natStatsProtocol }
    ::= { natStatsProtocolTable 1 }

NatStatsProtocolEntry ::= SEQUENCE {
    natStatsProtocol              NATProtocolType,
    natStatsProtocolInTranslates  Counter64,
    natStatsProtocolOutTranslates Counter64,
    natStatsProtocolRejectCount   Counter64
}

natStatsProtocol OBJECT-TYPE
    SYNTAX     NATProtocolType
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This object represents the protocol pertaining to which
             statistics are reported."
    ::= { natStatsProtocolEntry 1 }

natStatsProtocolInTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets, pertaining to the protocol
             identified by natStatsProtocol, that underwent NAT."
    ::= { natStatsProtocolEntry 2 }

natStatsProtocolOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets, pertaining to the protocol
             identified by natStatsProtocol, that underwent NAT."
    ::= { natStatsProtocolEntry 3 }

natStatsProtocolRejectCount OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of packets, pertaining to the protocol
             identified by natStatsProtocol, 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."


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     ::= { natStatsProtocolEntry 4 }

--
-- The Address Map Stats table
--

natStatsAddrMapTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatStatsAddrMapEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The (conceptual) table containing per address map NAT
             statistics."
    ::= { natStatistics 2 }

natStatsAddrMapEntry OBJECT-TYPE
    SYNTAX     NatStatsAddrMapEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "An entry (conceptual row) containing NAT statistics per
             address map."
    AUGMENTS   { natConfAddrMapEntry }
    ::= { natStatsAddrMapTable 1 }

NatStatsAddrMapEntry ::= SEQUENCE {
    natStatsAddrMapInTranslates  Counter64,
    natStatsAddrMapOutTranslates Counter64,
    natStatsAddrMapNoResource    Counter64,
    natStatsAddrMapAddrUsed      Gauge32
}

natStatsAddrMapInTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets, pertaining to this address
             map entry, that were translated."
    ::= { natStatsAddrMapEntry 3 }

natStatsAddrMapOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets, pertaining to this
             address map entry, that were translated."
    ::= { natStatsAddrMapEntry 4 }



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natStatsAddrMapNoResource OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    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."
    ::= { natStatsAddrMapEntry 5 }

natStatsAddrMapAddrUsed OBJECT-TYPE
    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    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 case of
             static address map."
    ::= { natStatsAddrMapEntry 6 }

--
-- The Stats Interface table
--

natStatsInterfaceTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatStatsInterfaceEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This table provides statistics information per
             interface."
    ::= { natStatistics 3 }

natStatsInterfaceEntry OBJECT-TYPE
    SYNTAX     NatStatsInterfaceEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry of the natStatsInterfaceTable represents stats
             pertaining to one interface, which is identified by its
             ifIndex."
    AUGMENTS { natConfInterfaceEntry }
    ::= { natStatsInterfaceTable 1 }






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NatStatsInterfaceEntry ::= SEQUENCE {
    natStatsInterfaceInTranslates   Counter64,
    natStatsInterfaceOutTranslates  Counter64
}

natStatsInterfaceInTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of packets received on this interface that
             were translated."
    ::= { natStatsInterfaceEntry 1 }

natStatsInterfaceOutTranslates OBJECT-TYPE
    SYNTAX     Counter64
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of translated packets that were sent out this
             interface."
    ::= { natStatsInterfaceEntry 2 }

--
-- Notifications section
--

natMIBNotifications OBJECT IDENTIFIER ::= { natMIB 0 }

--
-- Notifications
--


natPacketDiscard NOTIFICATION-TYPE
    OBJECTS { ifIndex }
    STATUS  current
    DESCRIPTION
            "This notification is generated whenever packets are
             discarded e.g. due to lack of mapping space when we run
             out of address/ports in case of Basic NAT/NAPT
             respectively.

             An agent should not generate more than one
             natPacketDiscard 'notification-events' in a given time
             interval (five seconds is the suggested default). A
             'notification-event' is the transmission of a single
             trap or inform PDU to a list of notification
             destinations.



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             If additional NAT packets are discarded within the
             throttling period, then notification-events for these
             changes should be suppressed by the agent until the
             current throttling period expires.  At the end of a
             throttling period, one notification-event should be
             generated if any NAT packet was discarded since the
             start of the throttling period. In such a case, another
             throttling period is started right away."
    ::= { natMIBNotifications 1 }

--
-- Conformance information.
--

natMIBConformance OBJECT IDENTIFIER ::= { natMIB 3 }

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

--
-- Units of conformance
--

natConfigGroup OBJECT-GROUP
    OBJECTS { natConfInterfaceRealm,
              natConfServiceType,
              natConfAddrMapConfigName,
              natConfStorageType,
              natConfRowStatus,
              natConfAddrMapEntryType,
              natConfAddrMapTranslationEntity,
              natConfLocalAddrType,
              natConfLocalAddrFrom,
              natConfLocalAddrTo,
              natConfLocalPortFrom,
              natConfLocalPortTo,
              natConfGlobalAddrType,
              natConfGlobalAddrFrom,
              natConfGlobalAddrTo,
              natConfGlobalPortFrom,
              natConfGlobalPortTo,
              natConfProtocol,
              natConfAddrMapStorageType,
              natConfAddrMapRowStatus,
              natConfUdpDefIdleTimeout,
              natConfIcmpDefIdleTimeout,
              natConfOtherDefIdleTimeout,
              natConfTcpDefIdleTimeout,
              natConfTcpDefNegTimeout }
    STATUS  current


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    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,
              natAddrBindSessionCount,
              natAddrBindMaxIdleTime,
              natAddrBindCurrentIdleTime,
              natAddrBindInTranslates,
              natAddrBindOutTranslates,
              natAddrBindRowStatus,
              natAddrPortBindNumberOfEntries,
              natAddrPortBindGlobalAddrType,
              natAddrPortBindGlobalAddr,
              natAddrPortBindGlobalPort,
              natAddrPortBindId,
              natAddrPortBindTranslationEntity,
              natAddrPortBindType,
              natAddrPortBindMapIndex,
              natAddrPortBindSessionCount,
              natAddrPortBindMaxIdleTime,
              natAddrPortBindCurrentIdleTime,
              natAddrPortBindInTranslates,
              natAddrPortBindOutTranslates,
              natAddrPortBindRowStatus,
              natSessionPrivateSrcEPBindId,
              natSessionPrivateSrcEPBindMode,
              natSessionPrivateDstEPBindId,
              natSessionPrivateDstEPBindMode,
              natSessionDirection,
              natSessionUpTime,
              natSessionAddrMapIndex,
              natSessionProtocolType,
              natSessionPrivateAddrType,
              natSessionPrivateSrcAddr,
              natSessionPrivateSrcPort,
              natSessionPrivateDstAddr,
              natSessionPrivateDstPort,
              natSessionPublicAddrType,
              natSessionPublicSrcAddr,
              natSessionPublicSrcPort,


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              natSessionPublicDstAddr,
              natSessionPublicDstPort,
              natSessionMaxIdleTime,
              natSessionCurrentIdleTime,
              natSessionInTranslates,
              natSessionOutTranslates,
              natSessionRowStatus }
    STATUS  current
    DESCRIPTION
            "A collection of BIND-related objects required to support
             management of devices supporting NAT."
    ::= { natMIBGroups 2 }

natStatsInterfaceGroup OBJECT-GROUP
    OBJECTS { natStatsInterfaceInTranslates,
              natStatsInterfaceOutTranslates }
    STATUS  current
    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 { natStatsProtocolInTranslates,
              natStatsProtocolOutTranslates,
              natStatsProtocolRejectCount }
    STATUS  current
    DESCRIPTION
            "A collection of protocol specific NAT statistics,
             to aid troubleshooting/monitoring of NAT operation."
    ::= { natMIBGroups 4 }

natStatsAddrMapGroup OBJECT-GROUP
    OBJECTS { natStatsAddrMapInTranslates,
              natStatsAddrMapOutTranslates,
              natStatsAddrMapNoResource,
              natStatsAddrMapAddrUsed }
    STATUS  current
    DESCRIPTION
            "A collection of address map specific NAT statistics,
             to aid troubleshooting/monitoring of NAT operation."
    ::= { natMIBGroups 5 }

natMIBNotificationGroup NOTIFICATION-GROUP
    NOTIFICATIONS { natPacketDiscard }
    STATUS        current
    DESCRIPTION
            "A collection of notifications which are generated by
            devices supporting this MIB."


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    ::= { natMIBGroups 6 }

--
-- Compliance statements
--

natMIBFullCompliance MODULE-COMPLIANCE
    STATUS  current
    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."
    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."
      GROUP       natTranslationGroup
      DESCRIPTION
               "Write access to this group is not required."

      OBJECT      natConfInterfaceRealm
      MIN-ACCESS  read-only
      DESCRIPTION
              "Write access is not required."

      OBJECT natConfRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

      OBJECT      natConfStorageType
      MIN-ACCESS  read-only
      DESCRIPTION
              "Write Access is not required."

      OBJECT  natConfLocalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."




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      OBJECT  natConfLocalAddrFrom
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natConfLocalAddrTo
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natConfGlobalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natConfGlobalAddrFrom
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natConfGlobalAddrTo
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT natConfAddrMapRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

      OBJECT      natConfAddrMapStorageType
      MIN-ACCESS  read-only
      DESCRIPTION
              "Write Access is not required."

      OBJECT  natAddrBindGlobalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."





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      OBJECT  natAddrBindGlobalAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT natAddrBindRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

      OBJECT  natAddrPortBindGlobalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natAddrPortBindGlobalAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT natAddrPortBindRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

      OBJECT  natSessionPrivateAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natSessionPrivateSrcAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natSessionPrivateDstAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."



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      OBJECT  natSessionPublicAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natSessionPublicSrcAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT  natSessionPublicDstAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "An implementation is only required to support IPv4
               addresses."

      OBJECT natSessionRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

    ::= { natMIBCompliances 1 }

natMIBReadOnlyCompliance MODULE-COMPLIANCE
    STATUS  current
    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 can not be
             configured with this MIB."

    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 natConfRowStatus
      SYNTAX RowStatus { active(1) }
      MIN-ACCESS   read-only



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      DESCRIPTION
              "Write access is not required, and active is the only
               status that needs to be supported."

      OBJECT  natConfLocalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natConfLocalAddrFrom
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natConfLocalAddrTo
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natConfGlobalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natConfGlobalAddrFrom
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natConfGlobalAddrTo
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT natConfAddrMapRowStatus
      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 { unknown(0), ipv4(1), ipv6(2) }




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      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natAddrBindGlobalAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT natAddrBindRowStatus
      SYNTAX RowStatus { active(1) }
      WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
      DESCRIPTION
              "Support for createAndWait and notInService is
               not required."

      OBJECT  natAddrPortBindGlobalAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natAddrPortBindGlobalAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT natAddrPortBindRowStatus
      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  natSessionPrivateAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natSessionPrivateSrcAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."





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      OBJECT  natSessionPrivateDstAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natSessionPublicAddrType
      SYNTAX  InetAddressType { unknown(0), ipv4(1), ipv6(2) }
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natSessionPublicSrcAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT  natSessionPublicDstAddr
      SYNTAX  InetAddress (SIZE(0|4|16))
      DESCRIPTION
              "Write access is not required. An implementation is only
               required to support IPv4 addresses."

      OBJECT natSessionRowStatus
      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."

    ::= { natMIBCompliances 2 }


END

















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6. Intellectual Property

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.

   Copies of claims of rights made available for publication and any
   assurances of licenses to be made available, or the result of an
   attempt made to obtain a general license or permission for the use of
   such proprietary rights by implementers or users of this
   specification can be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.






























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7. Change History

   A record of changes which will be removed before publication.

   10  September 2001

   o Added the following objects to support notifications:
     natConfAddrRiseThreshold, natConfAddrFallingThreshold,
     natAddrMapName and natPktDiscardReason.

   o Following notifications were added (there are still some
     unclear parameters though):
     natAddressUseRising and natPacketDiscard.

   10  November 2001

   o Dynamic and Static Address Map tables are Merged.

   o Protocol Extensibility added.

   o Rearrangement of OIDs done to get things in proper sequence.


   07  February 2002

   o Config and Interface Specific tables are Merged.

   o MAX-ACCESS for the bind and session entry objects are
     changed to be read-create.

   o natConfAddrMapType renamed to natConfAddrMapDirection.

   14 June 2002

   o Changed the syntax of natConfServiceType to BITS and renumbered
     the enumeration to start with 0.

   o Addressed the warning raised by smilint - all InetAddress values
     now restricted to the size range (0..20) i.e. valid InetAddress
     types are now ipv4, ipv6, ipv4z and ipv6z.

   o MIN-ACCESS for natConfInterfaceRealm restricted to read-only.

   o Changed the natConfIcmpDefIdleTimeout default value to be 300.

   o natConfProtConfigName made a part of the optional
     natConfProtGroup.

   o RFC 3291 now referred to instead of RFC 2578



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   2 Nov 2002

   o Added the Bind Origin Objects.

   o Updated the description of natSessionSecondBindId.

   o Interface specific statistics made mandatory.

   o New sections, 4.1, 4.2 and 4.3 added indicating relationship
     between tables and configuration guidelines.


   02 Sep 2003

   o Removed the protocol extensibility.

   o Incorporated other comments.


   21 Oct 2003

   o Rearranged notifications

   o Added new TEXTUAL-CONVENTIONs.

   o Incorporated other comments.


8.  Acknowledgements

   The authors of this memo would like to thank Randy Turner, Ashwini
   S T, Kevin Luehrs, Sam Sankoorikal, Juergen Quittek and
   Juergen Schoenwaelder for for their valuable feedback.



















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10.  Security Considerations

   It is clear that this MIB can be potentially useful for
   configuration. Unauthorized access to the write-able objects could
   cause a denial of service, and/or widespread network disturbance.
   Hence, the  support for SET operations in a non-secure
   environment without proper protection can have a negative effect on
   network operations.

   At this writing, no security holes have been identified beyond those
   that SNMP Security is itself intended to address. These relate
   primarily to controlled access to sensitive information and the
   ability to configure a device - or which might result from operator
   error, which is beyond the scope of any security architecture.

   There are a number of managed objects in this MIB that may contain
   information that may be sensitive from a business perspective, in
   that they may represent NAT bind and session information.
   The NAT bind and session objects reveal the identity of private
   hosts that are engaged in a session with external end nodes. A
   curious outsider could monitor these two objects to assess the
   number of private hosts being supported by the NAT device. Further,
   a disgruntled former employee of an enterprise could use the nat
   bind and session information to break into specific private hosts
   by intercepting the existing sessions or originate new
   sessions into the host. There are no objects which are sensitive in
   their own right, such as passwords or monetary amounts.
   It may be important to even control GET access to these objects and
   possibly to even encrypt the values of these objects when sending
   them over the network via SNMP.  Not all versions of SNMP provide
   features for such a secure environment.

   SNMP versions prior to SNMPv3 did not include adequate security.
   Even if the network itself is secure (for example by using IPSec),
   even then, 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.

   It is recommended that the implementers consider the security
   features as provided by the SNMPv3 framework (see [RFC3410], section
   8), including full support for the SNMPv3 cryptographic mechanisms
   (for authentication and privacy).

   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.


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11.  References

   11.1. Normative References

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

   [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
             Rose, M. and S. Waldbusser, "Textual Conventions for
             SMIv2", STD 58, RFC 2579, April 1999.

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

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

   [RFC2663] Srisuresh, P. and M. Holdrege, "NAT Terminology and
             Considerations", RFC 2663, August 1999.

   [RFC3291] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder,
             J., "Textual Conventions for Internet Network Addresses",
             RFC 3291, May 2002.

   [RFC792]  J. Postel, "Internet Control Message Protocol -
             DARPA Internet Program Protocol Specification",
             RFC 792, September 1981.

   [RFC3489] J. Rosenberg, J. Weinberger, C. Huitema, and R. Mahy,
             "STUN - Simple Traversal of User Datagram Protocol (UDP)
             Through Network Address Translators (NATs)", RFC 3489,
             March 2003.

   [IF-MIB]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
             MIB using SMIv2", RFC 2863, June 2000.


   11.2. Informative References

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






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12.  Author's Addresses

   R. Rohit
   Mascon Global Limted
   #59/2 100 ft Ring Road
   Banashankari II Stage
   Bangalore 560 070
   India
   Phone: +91 80 679 6227
   Email: rrohit74@hotmail.com

   Nalinaksh Pai
   Cisco Systems, Inc.
   Prestige Waterford
   No. 9, Brunton Road
   Bangalore - 560 025
   India
   Phone: +91 80 532 1300 extn. 6354
   Email: npai@cisco.com

   Rajiv Raghunarayan
   Cisco Systems Inc.
   170 West Tasman Drive
   San Jose, CA 95134
   Phone: +1 408 853 9612
   Email: raraghun@cisco.com

   Cliff Wang
   Information Security
   Bank One Corp
   1111 Polaris Pkwy
   Columbus, OH 43240
   Phone: +1 614 213 6117
   Email: cliffwang2000@yahoo.com

   P. Srisuresh
   Caymas Systems, Inc.
   1179-A North McDowell Blvd.
   Petaluma, CA 94954
   Tel: (707) 283-5063
   Email: srisuresh@yahoo.com











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13. Full Copyright Statement

   Copyright (C) The Internet Society (2003). All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph
   are included on all such copies and derivative works. However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

   Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.




















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