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NAT Working Group                                       R. Raghunarayan
INTERNET-DRAFT                                                   N. Pai
Expires March 2002                                  Cisco Systems, Inc.
                                                               R. Rohit
                                               World Wide Packets, Inc.
                                                                C. Wang
                                                       SmartPipes, Inc.
                                                         September 2001


  Definitions of Managed Objects for Network Address Translators (NAT)

                     <draft-ietf-nat-natmib-01.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 a Management Information Base (MIB) for use with
   network management protocols in the Internet community. In
   particular, it describes managed objects used for managing Network
   Address Translators (NAT).
















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Table of Contents

   1  Introduction ................................................2
   2  The Network Management Framework.............................2
   3  Terminology..................................................3
   4  Overview.....................................................3
   5  Definitions .................................................5
   6  Security Considerations.....................................45
   7  Future Directions...........................................46
   8  References .................................................46
   9  Acknowledgements ...........................................47
   10 Author's Addresses .........................................48
   11 Change History .............................................48

1.  Introduction

   This memo defines a portion of the Management Information Base
   (MIB) for use with network management protocols in the Internet
   community. In particular, it describes objects used for managing
   Network Address Translators (NAT) [17,19].

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 generically, throughout the document,
   to represent both NAT and NAPT. In cases, where necessary, NAPT and
   NAT will be used to mean port translation and address translation
   respectively, and appropriate usage would be clear from the
   context.

   The terms public/private are used throughout the document in the
   context of networks, while the terms local/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 bind group, and
   o the statistics group.

   The configuration group consists of four tables and two scalars:

   o the generic configuration table, which specifies among other
     things the type of NAT to be employed and the associated timers.
   o the static address map table, which is an extension of the
     generic configuration table, and specifies information required
     to setup static NAT.
   o the dynamic address map table, which again is an extension of the
     generic configuration table, but specifies information required
     to setup dynamic NAT.

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   o the interfaces table, which holds information regarding
     interfaces on which NAT is enabled.
   o the two scalars are used to monitor address thresholds and
     generate notifications when the thresholds are crossed.

   The bind group 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 mappings.
   o the Address-Port bind table, which holds the currently active
     transport mappings.
   o the session table, holds information regarding active NAT
     sessions.

   And finally, the statistics group consists of three tables:

   o the Protocol stats table, which holds NAT statistics on a per
     protocol basis.
   o the Address Map stats table, which holds NAT statistics on a
     per address map basis.
   o the Interface stats table, which holds NAT statistics on a per
     interface basis

   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.  Definitions

NAT-MIB DEFINITIONS ::= BEGIN

IMPORTS
     MODULE-IDENTITY,
     OBJECT-TYPE,
     Integer32,
     Unsigned32,
     Gauge32,
     Counter32,
     TimeTicks,
     IpAddress, -- NOTE: To be replaced with
                -- InetAddress/InetAddressType throughout the MIB.
     mib-2,
     NOTIFICATION-TYPE
             FROM SNMPv2-SMI
     MODULE-COMPLIANCE,
     NOTIFICATION-GROUP,
     OBJECT-GROUP
             FROM SNMPv2-CONF
     TEXTUAL-CONVENTION,
     StorageType,
     RowStatus
             FROM SNMPv2-TC
     InterfaceIndex
             FROM IF-MIB
     SnmpAdminString
             FROM SNMP-FRAMEWORK-MIB;
























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natMIB MODULE-IDENTITY
     LAST-UPDATED "200109100000Z"
     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.
               Prestige Waterford
               No. 9, Brunton Road
               Bangalore - 560 025
               India
               Phone: +91 80 532 1300
               Email: rrajiv@cisco.com

               Cliff Wang
               SmartPipes Inc.
               Suite 300, 565 Metro Place South
               Dublin, OH 43017
               Phone: +1 614 923 6241
               Email: CWang@smartpipes.com
             "
     DESCRIPTION
             "This MIB module defines the generic managed objects
              for NAT."
     REVISION     "200109100000Z"
     DESCRIPTION
             "Notifications added."
     REVISION     "200103010000Z"
     DESCRIPTION
             "Initial version of this MIB module."
     ::= { mib-2 xx } -- xx to be assigned by RFC-editor.

natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 }





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--
-- The Groups
-- o natConfig - Pertaining to NAT configuration information
-- o natBind - 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 }
natBind OBJECT IDENTIFIER ::= { natMIBObjects 2 }
natStatistics OBJECT IDENTIFIER ::= { natMIBObjects 3 }

--
-- Textual Conventions
--

NATProtocolType ::= TEXTUAL-CONVENTION
       STATUS       current
       DESCRIPTION
               "A list of protocols that are affected by NAT.
                Inclusion of values is not intended to imply that
                those protocols need be supported."
       SYNTAX       INTEGER {
                        other (1), -- not specified
                        icmp (2),
                        udp (3),
                        tcp (4)
                    }

--
-- The Configuration Group
-- The NAT Generic 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
    DESCRIPTION
            "Each entry in the natConfTable holds a set of
             configuration parameters associated with an instance
             of NAT.


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             Entries in the natConfTable are created and deleted
             using the natConfStatus object."
    INDEX   { IMPLIED natConfName }
    ::= { natConfTable 1 }

--
-- NOTE: The protocol specific parameters need to be moved into
-- protocol specific tables.
--

NatConfEntry ::= SEQUENCE {
    natConfName                 SnmpAdminString,
    natConfServiceType          INTEGER,
    natConfTimeoutIcmpIdle      Integer32,
    natConfTimeoutUdpIdle       Integer32,
    natConfTimeoutTcpIdle       Integer32,
    natConfTimeoutTcpNeg        Integer32,
    natConfTimeoutOther         Integer32,
    natConfMaxBindLeaseTime     Integer32,
    natConfMaxBindIdleTime      Integer32,
    natConfStorageType          StorageType,
    natConfStatus               RowStatus
}

natConfName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "The locally arbitrary, but unique identifier
             associated with this natConfEntry."
    ::= { natConfEntry 1 }

natConfServiceType OBJECT-TYPE
    SYNTAX  INTEGER {
                basicNat (1),
                napt (2),
                bidirectionalNat (3),
                twiceNat (4),
                multihomedNat (5)
            }
    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."
    ::= { natConfEntry 2 }





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natConfTimeoutIcmpIdle OBJECT-TYPE
    SYNTAX      Integer32 (0..2147483647)
    UNITS       "seconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The interval of time for which an ICMP protocol session,
             associated with this configuration, is allowed to remain
             valid without any activity."
    -- 1 minute
    DEFVAL { 60 }
    ::= { natConfEntry 3 }

natConfTimeoutUdpIdle OBJECT-TYPE
    SYNTAX      Integer32 (0..2147483647)
    UNITS       "seconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The interval of time for which a UDP protocol session,
             associated with this configuration, is allowed to remain
             valid without any activity."
    -- 5 minutes
    DEFVAL { 300 }
    ::= { natConfEntry 4 }

natConfTimeoutTcpIdle 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 data transfer phase."
    -- 24 hours
    DEFVAL { 86400 }
    ::= { natConfEntry 5 }

natConfTimeoutTcpNeg 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."


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    -- 1 minute
    DEFVAL { 60 }
    ::= { natConfEntry 6 }

natConfTimeoutOther OBJECT-TYPE
    SYNTAX      Integer32 (0..2147483647)
    UNITS       "seconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The interval of time for which a protocol session
             other than ICMP, UDP and TCP, associated with this
             configuration, is allowed to remain valid, without
             any activity."
    ::= { natConfEntry 7 }

natConfMaxBindLeaseTime OBJECT-TYPE
    SYNTAX      Integer32 (0..2147483647)
    UNITS       "seconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The maximum lease time for the BIND, associated with
             this configuration. Unless the lease time is renewed, a
             BIND will not be valid past the lease time. As a special
             case, a value of 0 may be assumed to indicate no lease
             time limit. Typically, this attribute is of relevance
             only in conjunction with Realm-Specific-IP (RSIP)
             operation."
    DEFVAL { 0 }
    ::= { natConfEntry 8 }

natConfMaxBindIdleTime OBJECT-TYPE
    SYNTAX      Integer32 (0..2147483647)
    UNITS       "seconds"
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The maximum time, associated with this configuration,
             to allow a dynamic BIND to remain valid with no NAT
             session hanging off this BIND. By default for NATIVE
             NAT maximum Idle time is 0. External agents could
             control this parameter differently. Static Binds and
             lease time limited BINDs are not affected by this
             parameter."
    DEFVAL { 0 }
    ::= { natConfEntry 9 }






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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 10 }

natConfStatus OBJECT-TYPE
    SYNTAX      RowStatus
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "The status of this conceptual row."
    ::= { natConfEntry 11 }


--
-- The Static Address Map Table
--

natConfStaticAddrMapTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF NatConfStaticAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table lists configuration for static NAT
             entries. This table has an expansion dependent
             relationship on the natConfTable. When an SNMP entity
             deletes a conceptual row from the natConfTable, then
             the corresponding entries are deleted from
             natConfStaticAddrMapTable."
    ::= { natConfig 2 }

natConfStaticAddrMapEntry OBJECT-TYPE
    SYNTAX      NatConfStaticAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A description of a static NAT entry. This entry
             contributes to the static NAT table of the device."
    INDEX   { natConfName, natConfStaticAddrMapName }
    ::= { natConfStaticAddrMapTable 1 }

--
-- NOTE: The natConfStaticAddrMapTable to be merged with
-- natConfDynamicAddrMapTable.
--


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NatConfStaticAddrMapEntry ::= SEQUENCE {
    natConfStaticAddrMapName         SnmpAdminString,
    natConfStaticAddrMapType         INTEGER,
    natConfStaticLocalAddrFrom       IpAddress,
    natConfStaticLocalAddrTo         IpAddress,
    natConfStaticLocalPortFrom       Integer32,
    natConfStaticLocalPortTo         Integer32,
    natConfStaticGlobalAddrFrom      IpAddress,
    natConfStaticGlobalAddrTo        IpAddress,
    natConfStaticGlobalPortFrom      Integer32,
    natConfStaticGlobalPortTo        Integer32,
    natConfStaticProtocol            BITS,
    natConfStaticAddrMapStorageType  StorageType,
    natConfStaticAddrMapStatus       RowStatus
}

natConfStaticAddrMapName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An arbitrary, but unique identifier associated with this
             natConfStaticAddrMapEntry. The value of this object is
             unique across both the static address map and the dynamic
             address map tables."
    ::= { natConfStaticAddrMapEntry 1 }

natConfStaticAddrMapType 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 external
             realm; whereas inbound address map refers to mapping a
             set of addresses from the external realm to private
             realm."
    ::= { natConfStaticAddrMapEntry 2 }

natConfStaticLocalAddrFrom OBJECT-TYPE
    SYNTAX      IpAddress
    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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    ::= { natConfStaticAddrMapEntry 3 }

natConfStaticLocalAddrTo OBJECT-TYPE
    SYNTAX      IpAddress
    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 natConfStaticLocalAddrFrom. The
             number addresses in the range defined by
             natConfStaticLocalAddrFrtvpom and natConfStaticLocalAddrTo
             should be equal to the number of addresses in the range
             defined by natConfStaticGlobalAddrFrom and
             natConfStaticGlobalAddrTo."
    ::= { natConfStaticAddrMapEntry 4 }

natConfStaticLocalPortFrom OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             natConfStaticLocalPortTo."
    ::= { natConfStaticAddrMapEntry 5 }

natConfStaticLocalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             natConfStaticLocalPortFrom."
    ::= { natConfStaticAddrMapEntry 6 }








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natConfStaticGlobalAddrFrom OBJECT-TYPE
    SYNTAX      IpAddress
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the first IP address of the range of
             IP addresses being mapped to."
    ::= { natConfStaticAddrMapEntry 7 }

natConfStaticGlobalAddrTo OBJECT-TYPE
    SYNTAX      IpAddress
    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 natConfStaticGlobalAddrFrom.The number addresses
             in the range defined by natConfStaticGlobalAddrFrom and
             natConfStaticGlobalAddrTo should be equal to the number
             of addresses in the range defined by
             natConfStaticLocalAddrFrom and
             natConfStaticLocalAddrTo. "
    ::= { natConfStaticAddrMapEntry 8 }

natConfStaticGlobalPortFrom OBJECT-TYPE
    SYNTAX      Integer32  (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic  NAT, 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
             natConfStaticGlobalPortTo."
    ::= { natConfStaticAddrMapEntry 9 }

natConfStaticGlobalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             natConfStaticGlobalPortFrom."
    ::= { natConfStaticAddrMapEntry 10 }

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natConfStaticProtocol OBJECT-TYPE
    SYNTAX      BITS {
                  all (0),
                  other (1),
                  icmp (2),
                  udp (3),
                  tcp (4)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies a protocol identifier. If the
             value of this object is '0', then this basic NAT entry
             applies to all IP traffic. If the value of this object
             is non-zero, then this NAT entry only applies to IP
             traffic with the specified protocol."
    ::= { natConfStaticAddrMapEntry 11 }

natConfStaticAddrMapStorageType 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 }
    ::= { natConfStaticAddrMapEntry 12 }

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

             To create a row in this table, a manager must set this
             object to either createAndGo(4) or createAndWait(5)."
    ::= { natConfStaticAddrMapEntry 13 }














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--
-- The Dynamic Address Map Table
--

natConfDynamicAddrMapTable OBJECT-TYPE
    SYNTAX      SEQUENCE OF NatConfDynamicAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This table lists dynamic NAT entries. This table has an
             expansion dependent relationship on the natConfTable.
             When an SNMP entity deletes a conceptual row from the
             natConfTable, then the corresponding entries are deleted
             from natConfDynamicAddrMapTable."
    ::= { natConfig 3 }

natConfDynamicAddrMapEntry OBJECT-TYPE
    SYNTAX      NatConfDynamicAddrMapEntry
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "A description of a dynamic NAT entry. This entry
             contributes to the dynamic NAT table of the device."
    INDEX   { natConfName, natConfDynamicAddrMapName }
    ::= { natConfDynamicAddrMapTable 1 }

NatConfDynamicAddrMapEntry ::= SEQUENCE {
     natConfDynamicAddrMapName         SnmpAdminString,
     natConfDynamicAddressMapType      INTEGER,
     natConfDynamicLocalAddrFrom       IpAddress,
     natConfDynamicLocalAddrTo         IpAddress,
     natConfDynamicLocalPortFrom       Integer32,
     natConfDynamicLocalPortTo         Integer32,
     natConfDynamicGlobalAddrFrom      IpAddress,
     natConfDynamicGlobalAddrTo        IpAddress,
     natConfDynamicGlobalPortFrom      Integer32,
     natConfDynamicGlobalPortTo        Integer32,
     natConfDynamicProtocol            BITS,
     natConfDynamicAddrMapStorageType  StorageType,
     natConfDynamicAddrMapStatus       RowStatus
}

natConfDynamicAddrMapName OBJECT-TYPE
    SYNTAX      SnmpAdminString (SIZE(1..32))
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "An arbitrary, but unique identifier associated with this
             natConfDynamicAddrMapEntry. The value of this object is
             unique across both the static address map and the dynamic
             address map tables."
    ::= { natConfDynamicAddrMapEntry 1 }

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natConfDynamicAddressMapType 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 external
             realm; whereas inbound address map refers to mapping a
             set of addresses from the external realm to private
             realm."
    ::= { natConfDynamicAddrMapEntry 2 }

natConfDynamicLocalAddrFrom OBJECT-TYPE
    SYNTAX      IpAddress
    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."
    ::= { natConfDynamicAddrMapEntry 3 }

natConfDynamicLocalAddrTo OBJECT-TYPE
    SYNTAX      IpAddress
    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."
    ::= { natConfDynamicAddrMapEntry 4 }

natConfDynamicLocalPortFrom OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             natConfDynamicLocalPortTo."
    ::= { natConfDynamicAddrMapEntry 5 }




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natConfDynamicLocalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-only
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             natConfDynamicLocalPortFrom."
    ::= { natConfDynamicAddrMapEntry 6 }

natConfDynamicGlobalAddrFrom OBJECT-TYPE
    SYNTAX      IpAddress
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the first IP address of the range
             of IP addresses being mapped to."
    ::= { natConfDynamicAddrMapEntry 7 }

natConfDynamicGlobalAddrTo OBJECT-TYPE
    SYNTAX      IpAddress
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies the last IP address of the range of
             IP addresses being mapped to."
    ::= { natConfDynamicAddrMapEntry 8 }

natConfDynamicGlobalPortFrom OBJECT-TYPE
    SYNTAX      Integer32  (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic  NAT, 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 of
             natConfDynamicGlobalPortTo."
    ::= { natConfDynamicAddrMapEntry 9 }








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natConfDynamicGlobalPortTo OBJECT-TYPE
    SYNTAX      Integer32 (0..65535)
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "If this conceptual row describes a basic NAT, 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
             to. If the translation specifies a single port, then the
             value of this object is equal to the value of
             natConfDynamicGlobalPortFrom."
    ::= { natConfDynamicAddrMapEntry 10 }

natConfDynamicProtocol OBJECT-TYPE
    SYNTAX      BITS {
                  all (0),
                  other (1),
                  icmp (2),
                  udp (3),
                  tcp (4)
                }
    MAX-ACCESS  read-create
    STATUS      current
    DESCRIPTION
            "This object specifies a protocol identifier. If the
             value of this object is '0', then this basic NAT entry
             applies to all IP traffic. If the value of this object is
             non-zero, then this NAT entry only applies to IP traffic
             with the specified protocol."
    ::= { natConfDynamicAddrMapEntry 11 }

natConfDynamicAddrMapStorageType 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 }
    ::= { natConfDynamicAddrMapEntry 12 }

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

             To create a row in this table, a manager must set this
             object to either createAndGo(4) or createAndWait(5)."

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    ::= { natConfDynamicAddrMapEntry 13 }

--
-- NAT Interface Table
--

natInterfaceTable OBJECT-TYPE
    SYNTAX     SEQUENCE OF NatInterfaceEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "This table holds information regarding the interface
             on which NAT is enabled."
    ::= { natConfig 4 }

natInterfaceEntry OBJECT-TYPE
    SYNTAX     NatInterfaceEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in the NAT Interface Table holds
             information regarding an interface on which NAT is
             enabled."
    INDEX   { natInterfaceIndex }
    ::= { natInterfaceTable 1 }

NatInterfaceEntry ::= SEQUENCE {
    natInterfaceIndex         InterfaceIndex,
    natInterfaceRealm         INTEGER,
    natInterfaceStorageType   StorageType,
    natInterfaceStatus        RowStatus
}

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

natInterfaceRealm 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 }

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    ::= { natInterfaceEntry 2 }

natInterfaceStorageType 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 }
    ::= { natInterfaceEntry 3 }

natInterfaceStatus OBJECT-TYPE
    SYNTAX     RowStatus
    MAX-ACCESS read-create
    STATUS     current
    DESCRIPTION
            "Status of NAT on this interface. An active status
             indicates that NAT is enabled on this interface."
    ::= { natInterfaceEntry 4 }


--
-- 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 5 }

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.

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            This object only represents the lower end of the
            hysteresis curve, and notifications are not generated when
            this threshold is crossed."
    DEFVAL  { 0 }
    ::= { natConfig 6 }

--
-- The BIND 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."
    ::= { natBind 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."
    ::= { natBind 2 }

natAddrBindEntry OBJECT-TYPE
    SYNTAX     NatAddrBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in the NAT BIND table holds information
             about a NAT BIND that is currently active."
    INDEX   { natAddrBindLocalAddr }
    ::= { natAddrBindTable 1 }

--
-- NOTE: BIND table may be restructured to attend to conditional NAT.
--




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NatAddrBindEntry ::= SEQUENCE {
    natAddrBindLocalAddr            IpAddress,
    natAddrBindGlobalAddr           IpAddress,
    natAddrBindId                   Unsigned32,
    natAddrBindDirection            INTEGER,
    natAddrBindType                 INTEGER,
    natAddrBindConfName             SnmpAdminString,
    natAddrBindSessionCount         Gauge32,
    natAddrBindCurrentIdleTime      TimeTicks,
    natAddrBindInTranslate          Counter32,
    natAddrBindOutTranslate         Counter32
}

natAddrBindLocalAddr OBJECT-TYPE
    SYNTAX     IpAddress
    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 1 }

natAddrBindGlobalAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    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 2 }

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 unique BIND id across both,
             the Address bind and Address-Port bind tables."
    ::= { natAddrBindEntry 3 }










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natAddrBindDirection OBJECT-TYPE
    SYNTAX     INTEGER {
                   uniDirectional (1),
                   biDirectional (2)
               }
    MAX-ACCESS read-only
    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. The direction of this bind
             is with reference to the private realm."
    ::= { natAddrBindEntry 4 }

natAddrBindType OBJECT-TYPE
    SYNTAX     INTEGER {
                   static (1),
                   dynamic (2)
               }
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object indicates whether the BIND is static or
             dynamic."
    ::= { natAddrBindEntry 5 }

natAddrBindConfName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(1..32))
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object is a pointer to the natConfTable entry (and
             the parameters of that entry) which was used in creating
             this BIND."
    ::= { natAddrBindEntry 6 }

natAddrBindSessionCount OBJECT-TYPE
    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of sessions currently using this BIND."
    ::= { natAddrBindEntry 7 }









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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 represented by this object is
             of relevance only when the value of Maximum Idle time
             (natConfMaxBindIdleTime) is non-zero."
    ::= { natAddrBindEntry 8 }

natAddrBindInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were successfully
             translated as per this BIND entry."
    ::= { natAddrBindEntry 9 }

natAddrBindOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were successfully
             translated as per this BIND entry."
    ::= { natAddrBindEntry 10 }

--
-- 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."
    ::= { natBind 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."
    ::= { natBind 4 }

--
-- NOTE: natAddrPortBindProtocol, a BITS, doesn't make sense as index.
-- This needs to be changed to a INTEGER object (of similar nature).
--

natAddrPortBindEntry OBJECT-TYPE
    SYNTAX     NatAddrPortBindEntry
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "Each entry in the this table holds information
             a NAPT BIND that is currently active."
    INDEX   { natAddrPortBindLocalAddr, natAddrPortBindLocalPort,
              natAddrPortBindProtocol }
    ::= { natAddrPortBindTable 1 }

NatAddrPortBindEntry ::= SEQUENCE {
    natAddrPortBindLocalAddr            IpAddress,
    natAddrPortBindLocalPort            Integer32,
    natAddrPortBindProtocol             BITS,
    natAddrPortBindGlobalAddr           IpAddress,
    natAddrPortBindGlobalPort           Integer32,
    natAddrPortBindId                   Unsigned32,
    natAddrPortBindDirection            INTEGER,
    natAddrPortBindType                 INTEGER,
    natAddrPortBindConfName             SnmpAdminString,
    natAddrPortBindSessionCount         Gauge32,
    natAddrPortBindCurrentIdleTime      TimeTicks,
    natAddrPortBindInTranslate          Counter32,
    natAddrPortBindOutTranslate         Counter32
}









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natAddrPortBindLocalAddr OBJECT-TYPE
    SYNTAX     IpAddress
    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 1 }

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."
    ::= { natAddrPortBindEntry 2 }

natAddrPortBindProtocol OBJECT-TYPE
    SYNTAX     BITS {
                 all (0),
                 other (1),
                 icmp (2),
                 udp (3),
                 tcp (4)
                }
    MAX-ACCESS  not-accessible
    STATUS      current
    DESCRIPTION
            "This object specifies a protocol identifier. If the
             value of this object is '0', then this BIND entry
             applies to all IP traffic. If the value of this object is
             non-zero, then this NAT entry only applies to IP traffic
             with the specified protocol."
    ::= { natAddrPortBindEntry 3 }










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natAddrPortBindGlobalAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    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 4 }

natAddrPortBindGlobalPort OBJECT-TYPE
    SYNTAX     Integer32(0..65535)
    MAX-ACCESS read-only
    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 5 }

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 6 }

natAddrPortBindDirection OBJECT-TYPE
    SYNTAX     INTEGER {
                   uniDirectional (1),
                   biDirectional (2)
               }
    MAX-ACCESS read-only
    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. The direction of this bind
             is with reference to the private realm."
    ::= { natAddrPortBindEntry 7 }


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natAddrPortBindType OBJECT-TYPE
    SYNTAX     INTEGER {
                   static (1),
                   dynamic (2)
               }
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object indicates whether the BIND is static or
             dynamic."
    ::= { natAddrPortBindEntry 8 }

natAddrPortBindConfName OBJECT-TYPE
    SYNTAX     SnmpAdminString
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "This object is a pointer to the natConfTable entry (and
             the parameters of that entry) which was used in creating
             this BIND."
    ::= { natAddrPortBindEntry 9 }

natAddrPortBindSessionCount OBJECT-TYPE
    SYNTAX     Gauge32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "Number of sessions currently using this BIND."
    ::= { natAddrPortBindEntry 10 }

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 represented by this object is
             of relevance only when the value of Maximum Idle time
             (natConfMaxBindIdleTime) is non-zero."
    ::= { natAddrPortBindEntry 11 }

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 12 }



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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 13 }


--
-- 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."
    ::= { natBind 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,
    natSessionOrigPrivateAddr      IpAddress,
    natSessionTransPrivateAddr     IpAddress,
    natSessionOrigPrivatePort      Integer32,
    natSessionTransPrivatePort     Integer32,
    natSessionOrigPublicAddr       IpAddress,
    natSessionTransPublicAddr      IpAddress,
    natSessionOrigPublicPort       Integer32,
    natSessionTransPublicPort      Integer32,
    natSessionCurrentIdletime      TimeTicks,
    natSessionSecondBindId         Unsigned32,
    natSessionInTranslate          Counter32,
    natSessionOutTranslate         Counter32
}

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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-only
    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-only
    STATUS     current
    DESCRIPTION
            "The protocol type of this session.

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

natSessionOrigPrivateAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The original IP address of the session endpoint that
             lies in the private network."
    ::= { natSessionEntry 6 }

natSessionTransPrivateAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    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 public IP Address
             (natSessionOrigPrivateAddr) when there is no
             translation."
    ::= { natSessionEntry 7 }

natSessionOrigPrivatePort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-only
    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."
    ::= { natSessionEntry 8 }








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natSessionTransPrivatePort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-only
    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 9 }

natSessionOrigPublicAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The original IP address of the session endpoint that lies
             in the public network."
    ::= { natSessionEntry 10 }

natSessionTransPublicAddr OBJECT-TYPE
    SYNTAX     IpAddress
    MAX-ACCESS read-only
    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 11 }

natSessionOrigPublicPort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-only
    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."
    ::= { natSessionEntry 12 }

natSessionTransPublicPort OBJECT-TYPE
    SYNTAX     Integer32 (0..65535)
    MAX-ACCESS read-only
    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."

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    ::= { natSessionEntry 13 }

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 14 }

natSessionSecondBindId OBJECT-TYPE
    SYNTAX     Unsigned32
    MAX-ACCESS read-only
    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 15 }

natSessionInTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of inbound packets that were translated by
             this session."
    ::= { natSessionEntry 16 }

natSessionOutTranslate OBJECT-TYPE
    SYNTAX     Counter32
    MAX-ACCESS read-only
    STATUS     current
    DESCRIPTION
            "The number of outbound packets that were translated by
             this session."
    ::= { natSessionEntry 17 }















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--
-- natStatistics Group
--

--
-- The Protocol Stats table
--

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 }


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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 }

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 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."
    INDEX   { natAddrMapStatsConfName, natAddrMapStatsMapName }
    ::= { natAddrMapStatsTable 1 }

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

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natAddrMapStatsConfName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(1..32))
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The name of the configuration (from the natConfTable),
             regarding which statistics are being reported. The
             configuration name along with Map name uniquely
             identifies an entry across both (static and dynamic)
             Address Map tables."
    ::= { natAddrMapStatsEntry 1 }

natAddrMapStatsMapName OBJECT-TYPE
    SYNTAX     SnmpAdminString (SIZE(1..32))
    MAX-ACCESS not-accessible
    STATUS     current
    DESCRIPTION
            "The name of the Address Map (from the
             natConfStaticAddrMapTable/natConfDynamicAddrMapTable),
             regarding which statistics are being reported. The
             configuration name along with Map name uniquely
             identifies an entry across both (static and dynamic)
             Address Map tables."
    ::= { natAddrMapStatsEntry 2 }

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 }

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 }











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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 should 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 augments the natInterfaceTable and provides
             statistics information pertaining to the specified
             interface."
    ::= { natStatistics 3 }

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 { natInterfaceEntry }
    ::= { natInterfaceStatsTable 1 }

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

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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 }

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 }










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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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-- Should natAddrMapStatsNoResource be used instead of natAddrMapName
-- - that will save us one extra object, but if/when the notification
-- is modified to include cases of explicitly packet discard due to
-- reasons other than resource exhaustion.. it might be better to
-- have AddrMap name. So we'll go with AddrMapName for now..

natPacketDiscard NOTIFICATION-TYPE
    OBJECTS { natAddrMapName, natPktDiscardReason }
    STATUS  current
    DESCRIPTION
            "This notification is generated whenever packets are
             discarded due to lack of mapping space i.e. when we run
             out of address/ports in case of 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."
-- 1. Is the 5 sec period OK as a throttling value??
    ::= { natNotifications 2 }

--
-- Conformance information.
-- NOTE: Will need to revisit this section; leaving this as is for
-- now.
--

natMIBConformance OBJECT IDENTIFIER ::= { natMIB 3 }
natMIBCompliances OBJECT IDENTIFIER ::= { natMIBConformance 1 }
natMIBGroups      OBJECT IDENTIFIER ::= { natMIBConformance 2 }

--
-- Compliance statements
--

natMIBCompliance MODULE-COMPLIANCE
    STATUS  current
    DESCRIPTION
            "The compliance statement for devices running NAT."
    MODULE  -- this module
      MANDATORY-GROUPS { natConfigGroup, natBindGroup }

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    ::= { natMIBCompliances 1 }


--
-- Units of conformance
--

natConfigGroup OBJECT-GROUP
    OBJECTS { natConfServiceType,
              natConfTimeoutIcmpIdle,
              natConfTimeoutUdpIdle,
              natConfTimeoutTcpIdle,
              natConfTimeoutTcpNeg,
              natConfTimeoutOther,
              natConfMaxBindLeaseTime,
              natConfMaxBindIdleTime,
              natConfStorageType,
              natConfStatus,
              natConfStaticAddrMapType,
              natConfStaticLocalAddrFrom,
              natConfStaticLocalAddrTo,
              natConfStaticLocalPortFrom,
              natConfStaticLocalPortTo,
              natConfStaticGlobalAddrFrom,
              natConfStaticGlobalAddrTo,
              natConfStaticGlobalPortFrom,
              natConfStaticGlobalPortTo,
              natConfStaticProtocol,
              natConfStaticAddrMapStorageType,
              natConfStaticAddrMapStatus,
              natConfDynamicAddressMapType,
              natConfDynamicLocalAddrFrom,
              natConfDynamicLocalAddrTo,
              natConfDynamicLocalPortFrom,
              natConfDynamicLocalPortTo,
              natConfDynamicGlobalAddrFrom,
              natConfDynamicGlobalAddrTo,
              natConfDynamicGlobalPortFrom,
              natConfDynamicGlobalPortTo,
              natConfDynamicProtocol,
              natConfDynamicAddrMapStorageType,
              natConfDynamicAddrMapStatus,
              natInterfaceRealm,
              natInterfaceStorageType,
              natInterfaceStatus }
    STATUS  current
    DESCRIPTION
            "A collection of configuration-related information
             required to support management of devices supporting
             NAT."
    ::= { natMIBGroups 1 }


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natBindGroup OBJECT-GROUP
    OBJECTS { natAddrBindNumberOfEntries,
              natAddrBindGlobalAddr,
              natAddrBindId,
              natAddrBindDirection,
              natAddrBindType,
              natAddrBindConfName,
              natAddrBindSessionCount,
              natAddrBindCurrentIdleTime,
              natAddrBindInTranslate,
              natAddrBindOutTranslate,
              natAddrPortBindNumberOfEntries,
              natAddrPortBindGlobalAddr,
              natAddrPortBindGlobalPort,
              natAddrPortBindId,
              natAddrPortBindDirection,
              natAddrPortBindType,
              natAddrPortBindConfName,
              natAddrPortBindSessionCount,
              natAddrPortBindCurrentIdleTime,
              natAddrPortBindInTranslate,
              natAddrPortBindOutTranslate,
              natSessionDirection,
              natSessionUpTime,
              natSessionProtocolType,
              natSessionOrigPrivateAddr,
              natSessionTransPrivateAddr,
              natSessionOrigPrivatePort,
              natSessionTransPrivatePort,
              natSessionOrigPublicAddr,
              natSessionTransPublicAddr,
              natSessionOrigPublicPort,
              natSessionTransPublicPort,
              natSessionCurrentIdletime,
              natSessionSecondBindId,
              natSessionInTranslate,
              natSessionOutTranslate }
    STATUS  current
    DESCRIPTION
            "A collection of BIND-related objects required to support
             management of devices supporting NAT."
    ::= { natMIBGroups 2 }











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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 }

natMIBNotifConfigGroup OBJECT-GROUP
    OBJECTS { natConfAddressRiseThreshold,
              natConfAddressFallThreshold }
    STATUS  current
    DESCRIPTION
            "A collection of configuration objects required to support
             the threshold-based notifications."
    ::= { natMIBGroups 4 }

natMIBNotificationObjectsGroup OBJECT-GROUP
    OBJECTS { natAddrMapName,
              natPktDiscardReason }
    STATUS  current
    DESCRIPTION
            "A collection of objects required to support NAT
             notifications."
    ::= { natMIBGroups 5 }

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

END









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6.  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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7.  Future Directions

    o Support for conditional NAT.

    o Provide for protocol specific configuration tables (thereby
      providing for extensibility).

    o Combine the static and dynamic address map tables (since they
      represent similar information).

    o The index into the natAddrPortBindProtocol, defined as BITS.
      It would make more sense to have this as INTEGER, but that
      would require deprecating the existing table and defining a
      new one. Further, the BIND table might also require
      modifications to support conditional NAT.

    o Usage of IpAddress as a datatype in the MIB is no longer
      allowed [20]. All occurences of IpAddress need to be replaced
      by InetAddressType and InetAddress.

    o Revisit the conformance/compliance section to evaluate what's
      necessary and what's not.

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.



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   [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.

   [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] Srisuresh, P., "Framework for interfacing with Network Address
        Translator", Work in Progress, November 2000.

   [20] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder, J.,
        "Textual Conventions for Internet Network Addresses", RFC
        2851, June 2000.

9.  Acknowledgements

   The authors of this memo would like to thank Pyda Srisuresh and
   Randy Turner for their valuable contribution to this MIB.



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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.
   Prestige Waterford
   No. 9, Brunton Road
   Bangalore - 560 025
   India
   Phone: +91 80 532 1300 extn. 6314
   Email: rrajiv@cisco.com

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





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Full Copyright Statement
   "Copyright (C) The Internet Society (2000). 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
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   copyrights defined in the Internet Standards process must be
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   The limited permissions granted above are perpetual and will not be
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   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
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   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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