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Versions: 00 01 02 03 04 05 06 07 08 09 RFC 4008

NAT Working Group                                       R. Raghunarayan
INTERNET-DRAFT                                                   N. Pai
Expires December 2002                               Cisco Systems, Inc.
                                                               R. Rohit
                                               World Wide Packets, Inc.
                                                                C. Wang
                                                       SmartPipes, Inc.
                                                           P. Srisuresh
                                                   Kuokoa Networks, Inc
                                                              June 2002


  Definitions of Managed Objects for Network Address Translators (NAT)

                     <draft-ietf-nat-natmib-04.txt>

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026 [16].

   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.

Abstract

   This memo defines an SMIv2 Management Information Base (MIB) for
   a device implementing traditional NAT [17] function. This may be
   used for configuration as well as monitoring of a device capable of
   traditional NAT function.













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Table of Contents

   1  Introduction ................................................2
   2  The Network Management Framework ............................2
   3  Terminology .................................................3
   4  Overview ....................................................3
   5  Extending this MIB ..........................................5
   6  Definitions .................................................6
   7  Security Considerations ....................................49
   8  References .................................................50
   9  Acknowledgements ...........................................51
   10 Author's Addresses .........................................52
   11 Change History .............................................53

1.  Introduction

   This memo defines an SMIv2 Management Information Base (MIB) for
   a device implementing traditional NAT [17] function. This may be
   used for configuration as well as monitoring of a device capable of
   traditional NAT function.

2.  The Network Management Framework

   The SNMP Management Framework presently consists of five major
   components:

   o    An overall architecture, described in RFC 2571 [1].

   o    Mechanisms for describing and naming objects and events for
        the purpose of management. The first version of this Structure
        of Management Information (SMI) is called SMIv1 and described
        in STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215
        [4]. The second version, called SMIv2, is described in STD 58,
        RFC 2578 [5], STD 58, RFC 2579 [6] and STD 58, RFC 2580 [7].

   o    Message protocols for transferring management information.
        The first version of the SNMP message protocol is called
        SNMPv1 and is described in STD 15, RFC 1157 [8]. A second
        version of the SNMP message protocol, which is not an Internet
        standards track protocol, is called SNMPv2c and described in
        RFC 1901 [9] and RFC 1906 [10]. The third version of the
        message protocol is called SNMPv3 and described in RFC 1906
        [10], RFC 2572 [11] and RFC 2574 [12].

   o    Protocol operations for accessing management information. The
        first set of protocol operations and associated PDU formats is
        described in STD 15, RFC 1157 [8]. A second set of protocol
        operations and associated PDU formats is described in RFC 1905
        [13].




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   o    A set of fundamental applications described in RFC 2573 [14]
        and the view-based access control mechanism described in RFC
        2575 [15].

   Managed Objects are accessed via virtual information store, termed
   the Management Information Base or MIB. Objects in the MIB are
   defined using a subset of Abstract Syntax Notation One (ASN.1)
   defined in the SMIv2.

   This memo specifies a MIB module that is compliant to the SMIv2. A
   MIB conforming to the SMIv1 can be produced through the appropriate
   translations. The resulting translated MIB must be semantically
   equivalent, except where objects or events are omitted because no
   translation is possible (use of Counter64). Some machine readable
   information in SMIv2 will be converted into textual descriptions in
   SMIv1 during the translation process. However, this loss of
   machine readable information is not considered to change the
   semantics of the MIB.

3.  Terminology

   The terminology used throughout this document is mostly as per RFC
   2663 [18].

   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 MIB module has been split into three groups:

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

   The configuration group consists of four tables and seven scalars:

   o the interface specific configuration table, which specifies the
     nat config parameters for a specific interface.
   o 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 the protocol specific table, which specifies protocol specific NAT
     configuration parameters. The table also provides extensibility
     for the configuration of the newer protocols.


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     Since most protocols e.g. TCP, UDP, ICMP, have idle timeouts as a
     common parameter for the configuration, this parameter has been
     added to the natConfProtTable. The extension tables, if any, may
     add other configuration parameters.
   o the tcp nat config table, which specifies tcp related NAT
     configuration parameters.
   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
     (unless overridden by protocol specific value in another mib).
   o two scalars used to monitor address thresholds and generate
     notifications when the thresholds are crossed.

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

   And finally, the statistics group consists of three tables:

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

   There are also two notifications defined in the MIB:

   o natAddressUseRising notifies the end user/manager of the address
     usage exceeding a pre-defined threshold.
   o And finally, natPacketDiscard notifies the end user/manager of
     packets being discarded due to lack of address mappings.











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5.  Extending this MIB

The NAT MIB has currently been defined to support only TCP, UDP and
ICMP as protocols. There are, though, points in the MIB to hook in
support for other protocols in the future.

Following is the list of protocol specific information, identified at
this point, which could potentially require protocol specific
extensions to this mib:

o Each protocol could support its set of timers and/or other protocol
  specific configuration parameters for operation with NAT.
o Statistics could be maintained per protocol, and type of
  statistics could be protocol specific.

To support the first requirement, the natConfTable consists of a
pointer (natConfProtConfigName) to a protocol configuration table,
natConfProtTable. The natConfProtTable consists of a pointer
(natConfProtSpecName) into a protocol specific configuration table.
The protocol specific configuration table can be used to
configure/retrieve protocol specific configuration parameters
pertaining to a NAT configuration. The natConfTcpTable, defined in
this mib module, is an example of a protocol specific configuration
table, which allows varying the TCP negotiation timeout for NAT.

To represent the configuration with an example, assume the existence
of the following row in the natConfTable, which contains a pointer to
a row in the protocol configuration table:

natConfInterfaceIndex = 1
natConfInterfaceRealm = private (1)
natConfServiceType = basicNat (1)
natConfProtConfigName = "Protocol Config 1"
natConfStorageType = nonVolatile (3)
natConfStatus = active (1)

The following row in natConfProtTable would contain a pointer to a row
in the TCP specific configuration table:

natConfProtName = "Protocol Config 1"
natConfProtType = tcp (5)
natConfProtSpecName = "TCP Config 1"
natConfProtIdleTimeout = 86400
natConfProtRowStatus = active (1)

And finally the following row in the TCP specific configuration table
would complete the TCP specific configuration:

natConfTcpName = "TCP Config 1"
natConfTcpNegTimeout = 120
natConfTcpRowStatus = active (1)


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If a new protocol FOO needs to be supported, a new protocol specific
configuration table could be defined in a FOO-NAT-MIB, with the index
of the table being an SnmpAdminString that is referenced via
natConfProtSpecName in natConfProtTable. The protocol specific
configuration parameters could be defined in this table, and linked to
a NAT configuration by the aforementioned mechanism.

The natProtocolStatsTable, on the other hand, represents statistics on
a per protocol basis, where the protocol is one of those defined in
the NATProtocolType textual convention. Only the basic per protocol
statistics are represented via the NAT MIB. If any further protocol
specific statistics need to be defined, they could be defined via
protocol specific statistics objects/table in the protocol specific
mib.

For e.g. if a protocol FOO needs a counter which represents the
packets rejected due to some event foobar, it would define a protocol
specific object fooNatFoobarReject in the FOO-NAT-MIB.

6.  Definitions

NAT-MIB DEFINITIONS ::= BEGIN

IMPORTS
     MODULE-IDENTITY,
     OBJECT-TYPE,
     Integer32,
     Unsigned32,
     Gauge32,
     Counter32,
     TimeTicks,
     mib-2,
     NOTIFICATION-TYPE
             FROM SNMPv2-SMI
     MODULE-COMPLIANCE,
     NOTIFICATION-GROUP,
     OBJECT-GROUP
             FROM SNMPv2-CONF
     StorageType,
     RowStatus
             FROM SNMPv2-TC
     InterfaceIndex
             FROM IF-MIB
     SnmpAdminString
             FROM SNMP-FRAMEWORK-MIB
     InetAddressType,
     InetAddress
             FROM INET-ADDRESS-MIB
     NATProtocolType
             FROM NAT-TC;



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natMIB MODULE-IDENTITY
     LAST-UPDATED "200206140000Z"
     ORGANIZATION "IETF NAT Working Group"
     CONTACT-INFO
             " Rohit
               World Wide Packets
               115 North Sullivan Road
               Veradale, Spokane, WA 99037
               Phone: +1 509 242 9320
               Email: Rohit.Rohit@worldwidepackets.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
               SmartPipes Inc.
               Suite 300, 565 Metro Place South
               Dublin, OH 43017
               Phone: +1 614 923 6241
               Email: CWang@smartpipes.com

               P. Srisuresh
               Kuokoa networks
               2901 Tasman Drive, Suite 202
               Santa Clara, CA 95054
               Phone: +1 408 970 0000
               Email: srisuresh@yahoo.com
             "
     DESCRIPTION
             "This MIB module defines the generic managed objects
              for NAT."
     REVISION     "200206140000Z"  -- 14th June 2002
     DESCRIPTION
             "This MIB module addresses the smilint warnings found
              in the IETF MIB Module Validation."





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     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 of this MIB module."
     ::= { mib-2 xx } -- xx to be assigned by RFC-editor.

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 }

--
-- The Configuration Group
-- The per-interface NAT Configuration Table
--

natConfTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF NatConfEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table specifies the configuration attributes for a
             device supporting NAT function."
    ::= { natConfig 1 }

natConfEntry OBJECT-TYPE
    SYNTAX      NatConfEntry
    MAX-ACCESS  not-accessible
    STATUS      current




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    DESCRIPTION
            "Each entry in the natConfTable holds a set of
             configuration parameters regarding the interface
             on which NAT is enabled."
    INDEX   { natConfInterfaceIndex }
    ::= { natConfTable 1 }

NatConfEntry ::= SEQUENCE {
    natConfInterfaceIndex       InterfaceIndex,
    natConfInterfaceRealm       INTEGER,
    natConfServiceType          BITS,
    natConfAddrMapConfigName    SnmpAdminString,
    natConfProtConfigName       SnmpAdminString,
    natConfStorageType          StorageType,
    natConfStatus               RowStatus
}

natConfInterfaceIndex OBJECT-TYPE
    SYNTAX     InterfaceIndex
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The ifIndex of the interface on which NAT is enabled."
    ::= { natConfEntry 1 }

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

natConfServiceType OBJECT-TYPE
    SYNTAX  BITS {
                basicNat (0),
                napt (1),
                bidirectionalNat (2),
                twiceNat (3),
                multihomedNat (4)
            }
    MAX-ACCESS  read-create
    STATUS      current





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    DESCRIPTION
            "An indication of the direction in which new sessions
             are permitted and the extent of translation done within
             the IP and transport headers."
    ::= { natConfEntry 3 }

natConfAddrMapConfigName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(0..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."
    DEFVAL { ''H }
    ::= { natConfEntry 4 }

natConfProtConfigName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(0..32))
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The index pointing to a set of protocol related
             NAT parameters in natProtConfTable.

             This object is used to point to protocol specific
             configuration that override any global (per-box)
             settings."
    DEFVAL { ''H }
    ::= { natConfEntry 5 }

natConfStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The storage type for this conceptual row."
    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    DEFVAL { nonVolatile }
    ::= { natConfEntry 6 }

natConfStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natConfEntry 7 }



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--
-- 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 2 }

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            Integer32,
    natConfAddrMapEntryType        INTEGER,
    natConfAddrMapDirection        INTEGER,
    natConfLocalAddrType           InetAddressType,
    natConfLocalAddrFrom           InetAddress,
    natConfLocalAddrTo             InetAddress,
    natConfLocalPortFrom           Integer32,
    natConfLocalPortTo             Integer32,
    natConfGlobalAddrType          InetAddressType,
    natConfGlobalAddrFrom          InetAddress,
    natConfGlobalAddrTo            InetAddress,
    natConfGlobalPortFrom          Integer32,
    natConfGlobalPortTo            Integer32,
    natConfProtocol                BITS,
    natConfAddrMapStorageType      StorageType,
    natConfAddrMapStatus           RowStatus
}

natConfAddrMapName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  not-accessible
    STATUS      current






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    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      Integer32 (1..2147483647)
    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 }

natConfAddrMapDirection OBJECT-TYPE
    SYNTAX  INTEGER {
                inbound (1),
                outbound (2),
                both (3)
            }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "Address (and Transport-ID) maps may be defined for
             both inbound and outbound direction.

             Outbound address map refers to mapping a selected set of
             addresses from private realm to a selected set of
             addresses in public realm, whereas inbound address map
             refers to mapping a set of addresses from the public
             realm to private realm."
    ::= { natConfAddrMapEntry 4 }





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natConfLocalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natConfLocalAddr."
    ::= { 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."
    ::= { 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 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 should be
             equal to the number of addresses in the range defined by
             natConfGlobalAddrFrom and natConfGlobalAddrTo."
    ::= { natConfAddrMapEntry 7 }

natConfLocalPortFrom OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object is 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 }





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natConfLocalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object is 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 }

natConfGlobalAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natConfGlobalAddrFrom."
    ::= { 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 should be
             equal to the number of addresses in the range defined by
             natConfLocalAddrFrom and natConfLocalAddrTo."
    ::= { natConfAddrMapEntry 12 }





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natConfGlobalPortFrom OBJECT-TYPE
    SYNTAX      Integer32  (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object is 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 }

natConfGlobalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a Basic NAT address
             mapping, then the value of this object is 0. If this
             conceptual describes NAPT, then the value of this object
             specifies the last port number in the range of ports
             being 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      BITS {
                  other (0),
                  icmp (1),
                  udp (2),
                  tcp (3)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies a protocol identifier."
    ::= { natConfAddrMapEntry 15 }

natConfAddrMapStorageType OBJECT-TYPE
    SYNTAX      StorageType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The storage type for this conceptual row."
    REFERENCE
            "Textual Conventions for SMIv2, Section 2."
    DEFVAL { nonVolatile }
    ::= { natConfAddrMapEntry 16 }


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natConfAddrMapStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natConfAddrMapEntry 17 }

--
-- UDP related NAT configuration
--

natConfUdpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default UDP idle timeout parameter. This applies
             to all NAT configuration unless overridden by a more
             specific value in the natConfProtTable."
    DEFVAL { 300 }
    ::= { natConfig 3 }

--
-- ICMP related NAT configuration
--

natConfIcmpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default ICMP idle timeout parameter. This applies to
             all NAT configuration unless overridden by a more
             specific value in the natConfProtTable."
    DEFVAL { 300 }
    ::= { natConfig 4 }

--
-- Other protocol parameters
--

natConfOtherDefIdleTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current




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    DESCRIPTION
            "The default idle timeout parameter for protocols
             represented by the value other (2) in NATProtocolType.
             This applies to all NAT configuration unless overridden
             by a more specific value in the natConfProtTable."
    DEFVAL { 60 }
    ::= { natConfig 5 }
--
-- TCP related NAT configuration
--

natConfTcpDefIdleTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default TCP idle timeout parameter. This applies to
             all NAT configuration unless overridden by a more
             specific value in the natConfProtTable."
    DEFVAL { 86400 }
    ::= { natConfig 6 }

natConfTcpDefNegTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "The default interval of time for which a TCP protocol
             session, is allowed to remain valid without any
             activity. This timeout value applies to a TCP session
             during its establishment and termination phases.
             This value is taken into account in the absence of a
             more specific  natConfTcpNegTimeout defined in the
             natConfTcpTable."
    DEFVAL { 60 }
    ::= { natConfig 7 }

--
-- NAT per protocol config table.
--

natConfProtTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatConfProtEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This table holds pointers to protocol specific parameters
             required by NAT."
::= { natConfig 8 }


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natConfProtEntry OBJECT-TYPE
    SYNTAX     NatConfProtEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in natConfProtTable points to a protocol
             specific table which holds parameters that are required
             for NAT configuration."
    INDEX   { natConfProtName, natConfProtType }
    ::= { natConfProtTable 1 }

NatConfProtEntry ::= SEQUENCE {
    natConfProtName             SnmpAdminString,
    natConfProtType             NATProtocolType,
    natConfProtSpecName         SnmpAdminString,
    natConfProtIdleTimeout      Integer32,
    natConfProtRowStatus        RowStatus
}

natConfProtName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(0..32))
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Name identifying a set of entries in this table that
             point to protocol specific NAT configuration. The
             combination of natConfProtName and natConfProtType
             uniquely identifies an entry in this table."
    ::= { natConfProtEntry 1 }

natConfProtType OBJECT-TYPE
    SYNTAX     NATProtocolType
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Identifies the protocol type.
             natConfProtSpecName points to an entry in the protocol
             specific table. For e.g. if natConfProtType is set to
             'tcp', natConfProtSpecName points to an entry in the
             natConfTcpTable."
    ::= { natConfProtEntry 2 }

natConfProtSpecName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(0..32))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
             "Index of an entry in the protocol specific table
              identified by natConfProtType."
    ::= { natConfProtEntry 3 }



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natConfProtIdleTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The interval of time for which the protocol session,
             associated with the protocol represented by
             natConfProtType, is allowed to remain valid without
             any activity."
    DEFVAL { 86400 }
    ::= { natConfProtEntry 4 }

natConfProtRowStatus OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
             "The status of this conceptual row."
    ::= { natConfProtEntry 5 }

natConfTcpTable  OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatConfTcpEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
             "This table holds TCP related NAT configuration entries
              which are pointed to by entries in the natConfProtTable
              having a natConfProtSpecType of 'tcp'."
    ::= { natConfig 9 }

natConfTcpEntry OBJECT-TYPE
    SYNTAX     NatConfTcpEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
             "Each entry contains TCP related NAT parameters. An entry
              in this table is pointed to by an entry in the
              natConfProtTable."
    INDEX   { natConfTcpName }
    ::= { natConfTcpTable 1 }

NatConfTcpEntry ::= SEQUENCE {
    natConfTcpName              SnmpAdminString,
    natConfTcpNegTimeout        Integer32,
    natConfTcpRowStatus         RowStatus
}






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natConfTcpName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(0..32))
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
             "Uniquely identifies an entry in this table."
    ::= { natConfTcpEntry 1 }

natConfTcpNegTimeout OBJECT-TYPE
    SYNTAX     Integer32 (0..2147483647)
    UNITS      "seconds"
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
             "The interval of time for which a TCP protocol session,
              associated with this configuration, is allowed to remain
              valid without any activity. This timeout value applies
              to a TCP session during its establishment and termination
              phases."
    DEFVAL { 60 }  -- 1 minute
    ::= { natConfTcpEntry 2 }

natConfTcpRowStatus OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
             "The status of this conceptual row."
    ::= { natConfTcpEntry 3 }

--
-- Notification thresholds
--

natConfAddressRiseThreshold OBJECT-TYPE
    SYNTAX     Unsigned32 (0..100)
    UNITS      "percentage"
    MAX-ACCESS read-write
    STATUS     current
    DESCRIPTION
            "This objects represents the rising threshold value for
             generation of the natAddressUseRising notification. A
             notification is generated whenever the usage percentage
             of the address map is equal to or greater than
             natConfAddressRiseThreshold.

             Notifications should not be generated when the value of
             this object is 0."
    DEFVAL  { 0 }
    ::= { natConfig 10 }



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natConfAddressFallThreshold OBJECT-TYPE
   SYNTAX     Unsigned32 (0..100)
   UNITS      "percentage"
   MAX-ACCESS read-write
   STATUS     current
   DESCRIPTION
           "This object represents the falling threshold value for
            generation of the natAddressUseRising notification.
            This object only represents the lower end of the
            hysteresis curve, and notifications are not generated
            when this threshold is crossed."
    DEFVAL  { 0 }
    ::= { natConfig 11 }

--
-- 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. This table only holds information
             regarding the active address 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."

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

NatAddrBindEntry ::= SEQUENCE {
    natAddrBindLocalAddrType        InetAddressType,
    natAddrBindLocalAddr            InetAddress,
    natAddrBindGlobalAddrType       InetAddressType,
    natAddrBindGlobalAddr           InetAddress,
    natAddrBindId                   Unsigned32,
    natAddrBindDirection            INTEGER,
    natAddrBindType                 INTEGER,
    natAddrBindAddrMapName          SnmpAdminString,
    natAddrBindSessionCount         Gauge32,
    natAddrBindCurrentIdleTime      TimeTicks,
    natAddrBindInTranslate          Counter32,
    natAddrBindOutTranslate         Counter32,
    natAddrBindStatus               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 }







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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 }

natAddrBindId OBJECT-TYPE
    SYNTAX     Unsigned32
    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 }

natAddrBindDirection OBJECT-TYPE
    SYNTAX     INTEGER {
                   uniDirectional (1),
                   biDirectional (2)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the direction of the BIND.
             A BIND may be either uni-directional or bi-directional,
             same as the orientation of the address map, based on
             which this bind is formed."
    ::= { natAddrBindEntry 6 }

natAddrBindType OBJECT-TYPE
    SYNTAX     INTEGER {
                   static (1),
                   dynamic (2)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object indicates whether the BIND is static or
             dynamic."
    ::= { natAddrBindEntry 7 }






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natAddrBindAddrMapName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(1..32))
    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. If the bind is being created by the
             Management Station, then it should set the value for this
             object to an existing addrMapName. An attempt to set this
             object to a nonExistent addrMapName will result in
             badValue error."
    ::= { natAddrBindEntry 8 }

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

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 10 }

natAddrBindInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were successfully
             translated using this BIND entry."
    ::= { natAddrBindEntry 11 }

natAddrBindOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were successfully
             translated using this BIND entry."
    ::= { natAddrBindEntry 12 }

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natAddrBindStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natAddrBindEntry 13 }

--
-- 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 }

--
-- 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."
    INDEX   { natAddrPortBindLocalAddrType, natAddrPortBindLocalAddr,
              natAddrPortBindLocalPort, natAddrPortBindProtocol }
::= { natAddrPortBindTable 1 }









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NatAddrPortBindEntry ::= SEQUENCE {
    natAddrPortBindLocalAddrType        InetAddressType,
    natAddrPortBindLocalAddr            InetAddress,
    natAddrPortBindLocalPort            Integer32,
    natAddrPortBindProtocol             NATProtocolType,
    natAddrPortBindGlobalAddrType       InetAddressType,
    natAddrPortBindGlobalAddr           InetAddress,
    natAddrPortBindGlobalPort           Integer32,
    natAddrPortBindId                   Unsigned32,
    natAddrPortBindDirection            INTEGER,
    natAddrPortBindType                 INTEGER,
    natAddrPortBindAddrMapName          SnmpAdminString,
    natAddrPortBindSessionCount         Gauge32,
    natAddrPortBindCurrentIdleTime      TimeTicks,
    natAddrPortBindInTranslate          Counter32,
    natAddrPortBindOutTranslate         Counter32,
    natAddrPortBindStatus               RowStatus
}

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     Integer32(0..65535)
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This object represents the private-realm specific port
             number (or query ID in case of ICMP messages) which, in
             conjunction with natAddrPortBindLocalAddr, maps to the
             public-realm network layer address and transport id
             represented by natAddrPortBindGlobalAddr and
             natAddrPortBindGlobalPort respectively."

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    ::= { 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 }

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     Integer32(0..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the port number (or query id in
             case of ICMP) that, in conjunction with
             natAddrPortBindGlobalAddr, maps to the private-realm
             network layer address and transport id represented by
             natAddrPortBindLocalAddr and natAddrPortBindLocalPort
             respectively."
    ::= { natAddrPortBindEntry 7 }





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natAddrPortBindId OBJECT-TYPE
    SYNTAX     Unsigned32
    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 }

natAddrPortBindDirection OBJECT-TYPE
    SYNTAX     INTEGER {
                   uniDirectional (1),
                   biDirectional (2)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object represents the direction of the BIND. A
             BIND may be either uni-directional or bi-directional,
             same as the orientation of the address map, based on
             which this bind is formed."
    ::= { natAddrPortBindEntry 9 }

natAddrPortBindType OBJECT-TYPE
    SYNTAX     INTEGER {
                   static (1),
                   dynamic (2)
               }
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object indicates whether the BIND is static or
             dynamic."
    ::= { natAddrPortBindEntry 10 }

natAddrPortBindAddrMapName OBJECT-TYPE
    SYNTAX     SnmpAdminString
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "This object is a pointer to the NatConfAddrMapEntry entry
             (and the parameters of that entry) which was used in
             creating this BIND. If the bind is being created by the
             Management Station, then it should set the value for
             this object as well. An attempt to set this object to a
             nonExistent addrMapName will result in badValue 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 }

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 13 }

natAddrPortBindInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were translated as per
             this BIND entry."
    ::= { natAddrPortBindEntry 14 }

natAddrPortBindOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were translated as per
             this BIND entry."
    ::= { natAddrPortBindEntry 15 }

natAddrPortBindStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natAddrPortBindEntry 16 }









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--
-- 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."
    INDEX   { natSessionBindId, natSessionId }
    ::= { natSessionTable 1 }

NatSessionEntry ::= SEQUENCE {
    natSessionBindId               Unsigned32,
    natSessionId                   Unsigned32,
    natSessionDirection            INTEGER,
    natSessionUpTime               TimeTicks,
    natSessionProtocolType         NATProtocolType,
    natSessionOrigPrivateAddrType  InetAddressType,
    natSessionOrigPrivateAddr      InetAddress,
    natSessionTransPrivateAddrType InetAddressType,
    natSessionTransPrivateAddr     InetAddress,
    natSessionOrigPrivatePort      Integer32,
    natSessionTransPrivatePort     Integer32,
    natSessionOrigPublicAddrType   InetAddressType,
    natSessionOrigPublicAddr       InetAddress,
    natSessionTransPublicAddrType  InetAddressType,
    natSessionTransPublicAddr      InetAddress,
    natSessionOrigPublicPort       Integer32,
    natSessionTransPublicPort      Integer32,
    natSessionCurrentIdletime      TimeTicks,
    natSessionSecondBindId         Unsigned32,
    natSessionInTranslate          Counter32,
    natSessionOutTranslate         Counter32,
    natSessionStatus               RowStatus
}






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natSessionBindId OBJECT-TYPE
    SYNTAX     Unsigned32
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This object represents a BIND id that is dynamically
             assigned to each BIND by a NAT enabled device. This
             bind id is that same as represented by the BindId
             objects in the Address bind and Address-Port bind
             tables."
    ::= { natSessionEntry 1 }

natSessionId OBJECT-TYPE
    SYNTAX     Unsigned32
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The session ID for this NAT session."
    ::= { natSessionEntry 2 }

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 3 }

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 4 }









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natSessionProtocolType OBJECT-TYPE
    SYNTAX     NATProtocolType
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The protocol type of this session.

             TCP and UDP sessions are uniquely identified by the
             tuple of (source IP address, source TCP/UDP port,
             destination IP address, destination TCP/UDP port).
             ICMP query sessions are identified by the tuple of
             (source IP address, ICMP query ID, destination IP
             address)."
    ::= { natSessionEntry 5 }

natSessionOrigPrivateAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionOrigPrivateAddr."
    ::= { natSessionEntry 6 }

natSessionOrigPrivateAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The original IP address of the session endpoint that
             lies in the private network."
    ::= { natSessionEntry 7 }

natSessionTransPrivateAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionTransPrivateAddr."
    ::= { natSessionEntry 8 }

natSessionTransPrivateAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The translated IP address of the session endpoint that
             lies in the private network. The value of this object
             is equal to that of the original private IP Address
             (natSessionOrigPrivateAddr) when there is no
             translation."

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    ::= { natSessionEntry 9 }

natSessionOrigPrivatePort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The original 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. The value
             of this object should be 0 when ports are not involved
             in the translation."
    ::= { natSessionEntry 10 }

natSessionTransPrivatePort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The translated transport port of the session that lies in
             the private network.The value of this object is equal to
             that of the original transport port
             (natSessionOrigPrivatePort) when there is no
             translation."
    ::= { natSessionEntry 11 }

natSessionOrigPublicAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionOrigPublicAddr."
    ::= { natSessionEntry 12 }

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

natSessionTransPublicAddrType OBJECT-TYPE
    SYNTAX      InetAddressType
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the address type used for
             natSessionTransPublicAddr."
    ::= { natSessionEntry 14 }

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natSessionTransPublicAddr OBJECT-TYPE
    SYNTAX     InetAddress (SIZE (0..20))
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The translated IP address of the session endpoint that
             belongs to the public network. The value of this object
             is equal to that of the original public IP Address
             (natSessionOrigPublicAddr) when there is no
             translation."
    ::= { natSessionEntry 15 }

natSessionOrigPublicPort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The original transport port of the session endpoint that
             belongs to the public network. If this is an ICMP
             session then the value contains the ICMP request ID.
             The value of this object should be 0 when ports are
             not involved in the translation."
    ::= { natSessionEntry 16 }

natSessionTransPublicPort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The translated transport port of the session endpoint
             that belongs to the public network. The value of this
             object is equal to that of the original transport port
             (natSessionOrigPublicPort) when there is no
             translation."
    ::= { natSessionEntry 17 }

natSessionCurrentIdletime OBJECT-TYPE
    SYNTAX     TimeTicks
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The time in one-hundredths of a second since a packet
             belonging to this session was last detected."
    ::= { natSessionEntry 18 }









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natSessionSecondBindId OBJECT-TYPE
    SYNTAX     Unsigned32
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "The natBindId of the 'other' NAT binding incase of Twice
             NAT.

             An instance of this object contains a valid value
             only if the binding type for this session is TwiceNAT."
    ::= { natSessionEntry 19 }

natSessionInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were translated for
             this session."
    ::= { natSessionEntry 20 }

natSessionOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were translated for
             this session."
    ::= { natSessionEntry 21 }

natSessionStatus OBJECT-TYPE
    SYNTAX       RowStatus
    MAX-ACCESS   read-create
    STATUS       current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natSessionEntry 22 }

--
-- natStatistics Group
--

--
-- The Protocol Stats table
--








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

natProtocolStatsEntry OBJECT-TYPE
    SYNTAX     NatProtocolStatsEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "An entry (conceptual row) containing NAT statistics
             pertaining to a particular protocol."
    INDEX   { natProtocolStatsName }
    ::= { natProtocolStatsTable 1 }

NatProtocolStatsEntry ::= SEQUENCE {
    natProtocolStatsName          NATProtocolType,
    natProtocolStatsInTranslate   Counter32,
    natProtocolStatsOutTranslate  Counter32,
    natProtocolStatsRejectCount   Counter32
}

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

natProtocolStatsInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets, pertaining to the protocol
             identified by natProtocolStatsName, that underwent NAT."
    ::= { natProtocolStatsEntry 2 }

natProtocolStatsOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets, pertaining to the protocol
             identified by natProtocolStatsName, that underwent NAT."
    ::= { natProtocolStatsEntry 3 }

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natProtocolStatsRejectCount OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of packets, pertaining to the protocol
             identified by natProtocolStatsName, 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."
     ::= { natProtocolStatsEntry 4 }

--
-- The Address Map Stats table
--

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

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

NatAddrMapStatsEntry ::= SEQUENCE {
    natAddrMapStatsInTranslate   Counter32,
    natAddrMapStatsOutTranslate  Counter32,
    natAddrMapStatsNoResource    Counter32,
    natAddrMapStatsAddrUsed      Gauge32
}

natAddrMapStatsInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets, pertaining to this address
             map entry, that were translated."
    ::= { natAddrMapStatsEntry 3 }



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natAddrMapStatsOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets, pertaining to this
             address map entry, that were translated."
    ::= { natAddrMapStatsEntry 4 }

natAddrMapStatsNoResource OBJECT-TYPE
    SYNTAX     Counter32
    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."
    ::= { natAddrMapStatsEntry 5 }

natAddrMapStatsAddrUsed 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 is irrelevant if the address map in
             question is a static address map."
    ::= { natAddrMapStatsEntry 6 }

--
-- The Interface Stats table
--

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









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

NatInterfaceStatsEntry ::= SEQUENCE {
    natInterfacePktsIn   Counter32,
    natInterfacePktsOut  Counter32
}

natInterfacePktsIn OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of packets received on this interface that
             were translated."
    ::= { natInterfaceStatsEntry 1 }

natInterfacePktsOut OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of translated packets that were sent out this
             interface."
    ::= { natInterfaceStatsEntry 2 }

--
-- Notifications section
--

natNotificationPrefix  OBJECT IDENTIFIER ::= { natMIB 2 }
natNotifications       OBJECT IDENTIFIER ::=
                       { natNotificationPrefix 0 }

--
-- Notification objects i.e. objects accessible only for notification
-- purpose.
--

natNotificationObjects OBJECT IDENTIFIER ::=
                       { natNotificationPrefix 1 }




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natAddrMapName OBJECT-TYPE
    SYNTAX     SnmpAdminString
    MAX-ACCESS accessible-for-notify
    STATUS     current
    DESCRIPTION
            "This object represent the address map corresponding to
             which the addresses/ports have been exhausted, thereby
             resulting in a natPacketDiscard notification."
    ::= { natNotificationObjects 1 }

natPktDiscardReason OBJECT-TYPE
    SYNTAX      INTEGER {
                    other (1),
                    addressSpaceExhausted (2)
                }
    MAX-ACCESS accessible-for-notify
    STATUS     current
    DESCRIPTION
            "This object represents the reason for which a packet is
             discarded by NAT.

             addressSpaceExhausted (2) represents a situation wherein
             the address space required to do this mapping has been
             exhausted (used up by other translations).

             other (1) represents a case where the packet was
             discarded due to any other reasons."
    ::= { natNotificationObjects 2 }

--
-- Notifications
--

natAddressUseRising NOTIFICATION-TYPE
    OBJECTS { natAddrMapStatsAddrUsed }
    STATUS  current
    DESCRIPTION
            "This notification is generated whenever the number of
             addresses per address map is equal to or greater than the
             configured address rising threshold value.

             Note that once this notification is generated, another
             notification for the same address map should be generated
             only after the address usage falls to/below the defined
             falling threshold.

             This notification should be generated only for dynamic
             address maps, since they do not provide any useful
             information for static maps."
    ::= { natNotifications 1 }



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natPacketDiscard NOTIFICATION-TYPE
    OBJECTS { natAddrMapName, natPktDiscardReason }
    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.

             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."
    ::= { natNotifications 2 }

--
-- 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,
              natConfStatus,
              natConfAddrMapEntryType,
              natConfAddrMapDirection,
              natConfLocalAddrType,
              natConfLocalAddrFrom,
              natConfLocalAddrTo,
              natConfLocalPortFrom,


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              natConfLocalPortTo,
              natConfGlobalAddrType,
              natConfGlobalAddrFrom,
              natConfGlobalAddrTo,
              natConfGlobalPortFrom,
              natConfGlobalPortTo,
              natConfProtocol,
              natConfAddrMapStorageType,
              natConfAddrMapStatus,
              natConfUdpDefIdleTimeout,
              natConfIcmpDefIdleTimeout,
              natConfOtherDefIdleTimeout,
              natConfTcpDefIdleTimeout,
              natConfTcpDefNegTimeout }
    STATUS  current
    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,
              natAddrBindDirection,
              natAddrBindType,
              natAddrBindAddrMapName,
              natAddrBindSessionCount,
              natAddrBindCurrentIdleTime,
              natAddrBindInTranslate,
              natAddrBindOutTranslate,
              natAddrBindStatus,
              natAddrPortBindNumberOfEntries,
              natAddrPortBindGlobalAddrType,
              natAddrPortBindGlobalAddr,
              natAddrPortBindGlobalPort,
              natAddrPortBindId,
              natAddrPortBindDirection,
              natAddrPortBindType,
              natAddrPortBindAddrMapName,
              natAddrPortBindSessionCount,
              natAddrPortBindCurrentIdleTime,
              natAddrPortBindInTranslate,
              natAddrPortBindOutTranslate,
              natAddrPortBindStatus,
              natSessionDirection,
              natSessionUpTime,
              natSessionProtocolType,
              natSessionOrigPrivateAddrType,
              natSessionOrigPrivateAddr,

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              natSessionTransPrivateAddrType,
              natSessionTransPrivateAddr,
              natSessionOrigPrivatePort,
              natSessionTransPrivatePort,
              natSessionOrigPublicAddrType,
              natSessionOrigPublicAddr,
              natSessionTransPublicAddrType,
              natSessionTransPublicAddr,
              natSessionOrigPublicPort,
              natSessionTransPublicPort,
              natSessionCurrentIdletime,
              natSessionSecondBindId,
              natSessionInTranslate,
              natSessionOutTranslate,
              natSessionStatus }
    STATUS  current
    DESCRIPTION
            "A collection of BIND-related objects required to support
             management of devices supporting NAT."
    ::= { natMIBGroups 2 }

natStatsGroup OBJECT-GROUP
    OBJECTS { natProtocolStatsInTranslate,
              natProtocolStatsOutTranslate,
              natProtocolStatsRejectCount,
              natAddrMapStatsInTranslate,
              natAddrMapStatsOutTranslate,
              natAddrMapStatsNoResource,
              natAddrMapStatsAddrUsed,
              natInterfacePktsIn,
              natInterfacePktsOut }
    STATUS  current
    DESCRIPTION
            "A collection of NAT statistics related objects required
             to support troubleshooting/monitoring NAT operation."
    ::= { natMIBGroups 3 }

natConfProtGroup OBJECT-GROUP
    OBJECTS { natConfProtConfigName
              natConfProtSpecName,
              natConfProtIdleTimeout,
              natConfProtRowStatus }
    STATUS  current
    DESCRIPTION
            "A collection of objects to facilitate protocol related
             NAT configuration."
    ::= { natMIBGroups 4 }






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natConfTcpGroup OBJECT-GROUP
    OBJECTS { natConfTcpNegTimeout,
              natConfTcpRowStatus }
    STATUS  current
    DESCRIPTION
            "A collection of TCP related NAT parameter objects
             used for NAT configuration."
    ::= { natMIBGroups 5 }

natMIBNotifConfigGroup OBJECT-GROUP
    OBJECTS { natConfAddressRiseThreshold,
              natConfAddressFallThreshold }
    STATUS  current
    DESCRIPTION
            "A collection of configuration objects required to support
             the threshold-based notifications."
    ::= { natMIBGroups 6 }

natMIBNotificationObjectsGroup OBJECT-GROUP
    OBJECTS { natAddrMapName,
              natPktDiscardReason }
    STATUS  current
    DESCRIPTION
            "A collection of objects required to support NAT
             notifications."
    ::= { natMIBGroups 7 }

natMIBNotificationGroup NOTIFICATION-GROUP
    NOTIFICATIONS { natAddressUseRising,
                    natPacketDiscard }
    STATUS        current
    DESCRIPTION
            "A collection of notifications which are generated by
            devices supporting this MIB."
    ::= { natMIBGroups 8 }

--
-- Compliance statements
--

natMIBCompliance MODULE-COMPLIANCE
    STATUS  current
    DESCRIPTION
            "The compliance statement for devices running NAT."
    MODULE  -- this module
      MANDATORY-GROUPS { natConfigGroup, natTranslationGroup }
      GROUP       natConfProtGroup
      DESCRIPTION
               "This group is mandatory if any of the protocol
                specific tables (below) are supported."



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      GROUP       natConfTcpGroup
      DESCRIPTION
               "This group is mandatory if tcp is supported over nat."
      GROUP       natStatsGroup
      DESCRIPTION
               "This group is optional."
      GROUP       natMIBNotifConfigGroup
      DESCRIPTION
               "This group is optional."
      GROUP       natMIBNotificationObjectsGroup
      DESCRIPTION
               "This group is optional."
      GROUP       natMIBNotificationGroup
      DESCRIPTION
               "This group is optional."
      OBJECT      natConfInterfaceRealm
      MIN-ACCESS  read-only
      DESCRIPTION
              "Write access is not required."
    ::= { natMIBCompliances 1 }

END































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NAT-TC DEFINITIONS ::= BEGIN

IMPORTS
    MODULE-IDENTITY,
    mib-2
            FROM SNMPv2-SMI
    TEXTUAL-CONVENTION
            FROM SNMPv2-TC;

natTextualConventions  MODULE-IDENTITY
    LAST-UPDATED "200111090000Z"
    ORGANIZATION "IETF NAT Working Group"
    CONTACT-INFO
             " Rohit
               World Wide Packets
               115 North Sullivan Road
               Veradale, Spokane, WA 99037
               Phone: +1 509 242 9320
               Email: Rohit.Rohit@worldwidepackets.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
               SmartPipes Inc.
               Suite 300, 565 Metro Place South
               Dublin, OH 43017
               Phone: +1 614 923 6241
               Email: CWang@smartpipes.com

               P. Srisuresh
               Kuokoa networks
               2901 Tasman Drive, Suite 202
               Santa Clara, CA 95054
               Phone: +1 408 970 0000
               Email: srisuresh@yahoo.com
             "



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     DESCRIPTION
             "This MIB module defines the NATProtocolType textual
              convention for use in MIBs that need to identify the
              protocols which support network address translation."

     REVISION     "200111090000Z"  -- 9th Nov. 2001
     DESCRIPTION
             "Initial version of this MIB module."
     ::= { mib-2 xx } -- to be assigned by RFC-editor

NATProtocolType ::= TEXTUAL-CONVENTION
       STATUS       current
       DESCRIPTION
               "A list of protocols that are affected/support
                network address translation. Inclusion of values is
                not intended to imply that those protocols need be
                supported."
       SYNTAX       INTEGER {
                        none (1),  -- not specified
                        other (2), -- none of the following
                        icmp (3),
                        udp (4),
                        tcp (5)
                    }

END



























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7.  Security Considerations

   This MIB contains readable objects whose values provide information
   related to nat binds and sessions. Some of these objects could
   contain sensitive information e.g. bind information. There are
   a number of management objects defined in this MIB that have a
   MAX-ACCESS clause of read-write and/or read-create. Such objects
   may be considered sensitive or vulnerable in some network
   environments.

   While unauthorized access to the readable objects may be relatively
   innocuous, 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.

   SNMPv1 by itself is not a secure environment. Even if the network
   itself is secure, 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 implementors consider the security
   features as provided by the SNMPv3 framework. Specifically, the use
   of the User-based Security Model RFC 2574 [12] and the View-based
   Access Control Model RFC 2575 [15] is recommended.

   It is then a customer/user responsibility to ensure that the SNMP
   entity giving access to an instance of this MIB, 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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8.  References

   [1]  Wijnen, B., Harrington, D. and R. Presuhn, "An Architecture
        for Describing SNMP Management Frameworks", RFC 2571, April
        1999.

   [2]  Rose, M. and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", STD 16,
        RFC 1155, May 1990.

   [3]  Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
        RFC 1212, March 1991.

   [4]  Rose, M., "A Convention for Defining Traps for use with the
        SNMP", RFC 1215, March 1991.

   [5]  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.

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

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

   [8]  Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
        Network Management Protocol", STD 15, RFC 1157, May 1990.

   [9]  Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Introduction to Community-based SNMPv2", RFC 1901, January
        1996.

   [10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Transport Mappings for Version 2 of the Simple Network
        Management Protocol (SNMPv2)", RFC 1906, January 1996.

   [11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
        Processing and Dispatching for the Simple Network Management
        Protocol (SNMP)", RFC 2572, April 1999.

   [12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
        for version 3 of the Simple Network Management Protocol
        (SNMPv3)", RFC 2574, April 1999.

   [13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
        "Protocol Operations for Version 2 of the Simple Network
        Management Protocol (SNMPv2)", RFC 1905, January 1996.



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   [14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC
        2573, April 1999.

   [15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management
        Protocol (SNMP)", RFC 2575, April 1999.

   [16] Bradner, S., "The Internet Standards Process -- Revision 3",
        BCP 9, RFC 2026, October 1996.

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

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

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

9.  Acknowledgements

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


10.  Author's Addresses

   Rohit R.
   World Wide Packets
   115 North Sullivan Road
   Veradale, Spokane, WA 99037
   Phone: +1 509 242 9320
   Email: Rohit.Rohit@worldwidepackets.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



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INTERNET-DRAFT                 NAT MIB                       June 2002


   Cliff Wang
   SmartPipes Inc.
   Suite 300, 565 Metro Place South
   Dublin, OH 43017
   Phone: +1 614 923 6241
   Email: CWang@smartpipes.com

   P. Srisuresh
   Kuokoa networks
   2901 Tasman Drive, Suite 202
   Santa Clara, CA 95054
   Phone: +1 408 970 0000
   Email: srisuresh@yahoo.com


11. Change History

   A record of changes which will be removed before publication.

   10  September 2001

   o Added the following objects to support notifications:
     natConfAddressRiseThreshold, natConfAddressFallThreshold,
     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.



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INTERNET-DRAFT                 NAT MIB                       June 2002


   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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