Internet Engineering Task Force                                    Y. Fu
Internet-Draft                                                  S. Jiang
Intended status: Standards Track            Huawei Technologies Co., Ltd
Expires: January 3, July 2, 2015                                            J. Dong
                                                                 Y. Chen
                                                     Tsinghua University
                                                            July 2,
                                                       December 29, 2014

               DS-Lite Management Information Base (MIB)
                   draft-ietf-softwire-dslite-mib-06
                   draft-ietf-softwire-dslite-mib-07

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for using with network management protocols in the Internet
   community.  In particular, it defines managed objects for Dual-Stack
   Lite (DS-Lite).

Status of This Memo

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

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

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

   This Internet-Draft will expire on January 3, July 2, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  The Internet-Standard Management Framework  . . . . . . . . .   3
   4.  Relationship to the IF-MIB  . . . . . . . . . . . . . . . . .   3
   5.  Difference from the IP tunnel MIB and NAT MIB . . . . . . . .   3
   6.  Structure of the MIB Module . . . . . . . . . . . . . . . . .   4
     6.1.  The Object Group  . . . . . . . . . . . . . . . . . . . .   5
       6.1.1.  The dsliteTunnel Subtree  . . . . . . . . . . . . . .   5
       6.1.2.  The dsliteNAT Subtree . . . . . . . . . . . . . . . .   5
       6.1.3.  The dsliteInfo Subtree  . . . . . . . . . . . . . . .   5
     6.2.  The Notification Group  . . . . . . . . . . . . . . . . .   5
       6.2.1.  The dsliteTrap Subtree  . . . . . . . . . . . . . . .   5
     6.3.  The Conformance Group . . . . . . . . . . . . . . . . . .   5
   7.  MIB modules required for IMPORTS  . . . . . . . . . . . . . .   5
   8.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  20
     12.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   Dual-Stack Lite [RFC6333] is a solution to offer both IPv4 and IPv6
   connectivity to customers crossing an IPv6 only infrastructure.  One
   of its key components is an IPv4-over-IPv6 tunnel, which is used to
   provide IPv4 connectivity across a service provider's IPv6 network.
   Another key component is a carrier-grade IPv4-IPv4 Network Address
   Translation (NAT) to share service provider IPv4 addresses among
   customers.

   This document defines a portion of the Management Information Base
   (MIB) for using with network management protocols in the Internet
   community.  This MIB module may be used for configuration and
   monitoring devices in a Dual-Stack Lite scenario.

2.  Requirements Language

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

   [RFC2119] when they appear in ALL CAPS.  When these words are not in
   ALL CAPS (such as "should" or "Should"), they have their usual
   English meanings, and are not to be interpreted as [RFC2119] key
   words.

3.  The Internet-Standard Management Framework

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

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB
   module that is compliant to the SMIv2, which is described in
   [RFC2578], [RFC2579] and [RFC2580].

4.  Relationship to the IF-MIB

   The Interfaces MIB [RFC2863] defines generic managed objects for
   managing interfaces.  Each logical interface (physical or virtual)has
   an ifEntry.  Tunnels are handled by creating a logical interface
   (ifEntry) for each tunnel.  Each DS-Lite tunnel also acts as a
   virtual interface, which has a corresponding entry in the IP Tunnel
   MIB and Interface MIB.  Those corresponding entries are indexed by
   ifIndex.

   The ifOperStatus in ifTable is used to represent whether the DS-Lite
   tunnel function has been originated.  The ifInUcastPkts defined in
   ifTable will represent the number of IPv4 packets that have been
   encapsulated into IPv6 packets sent to a B4.  The ifOutUcastPkts
   defined in ifTable contains the number of IPv6 packets that can be
   decapsulated to IPv4 in the virtual interface.  Also, the IF-MIB
   defines ifMtu for the MTU of this tunnel interface, so DS-Lite MIB
   does not need to define the MTU for the tunnel.

5.  Difference from the IP tunnel MIB and NAT MIB

   The key technologies for DS-Lite are IP in IP (IPv4-in-IPv6) tunnels
   and NAT (IPv4 to IPv4 translation).

   Notes: According to section 5.2 of [RFC6333], DS-Lite only defines
   IPv4 in IPv6 tunnels at this moment, but other types of encapsulation
   could be defined in the future.  So this DS-Lite MIB only supports IP
   in IP encapsulation, if another RFC defined other tunnel types in the
   future, this DS-Lite MIB will be updated then.

   The NAT MIB [I-D.ietf-behave-nat-mib] is designed to carry
   translation from any address family to any address family, therefore
   it supports IPv4 to IPv4 translation.

   The IP Tunnel MIB [RFC4087] is designed for managing tunnels of any
   type over IPv4 and IPv6 networks, therefore it supports IP in IP
   tunnels.

   However, the NAT MIB and IP Tunnel MIB together are not sufficient to
   support DS-Lite.  This document describes the specific MIB
   requirements for DS-Lite, as below.

      In a DS-Lite scenario, the tunnel type is IP in IP, more
      precisely, is IPv4 in IPv6.  Therefore, it is unnecessary to
      describe tunnel type in DS-Lite MIB.

      In a DS-Lite scenario, the translation type is IPv4 private
      address to IPv4 public address.  Therefore, it is unnecessary to
      describe the type of address in the corresponding
      tunnelIfLocalInetAddress and tunnelIfRemoteInetAddress objects
      which are defined in the IP Tunnel MIB for DS-Lite MIB.

      In a DS-Lite scenario, the AFTR is not only the tunnel end
      concentrator, but also a 4-4 translator.  Within the Address
      Family Transition Router (AFTR), tunnel information and
      translation information MUST be mapped each other.  But the tunnel
      entry defined in the IP Tunnel MIB and the NAT mapping entry
      defined in the NAT MIB are not able to reflect this mapping
      relationship.  Therefore, a combined MIB is necessary.

   The implementation of the IP Tunnel MIB is required for DS-Lite.  The
   tunnelIfEncapsMethod in the tunnelIfEntry should be set to
   dsLite("xx"), and a corresponding entry in the DS-Lite module will
   exist for every tunnelIfEntry with this tunnelIfEncapsMethod.  The
   tunnelIfRemoteInetAddress must be set to "::".

6.  Structure of the MIB Module

   The DS-Lite MIB provides a way to monitor and manage the devices
   (AFTRs) in DS-Lite scenario through SNMP.

   The DS-Lite MIB is configurable on a per-interface basis.  It depends
   on several parts of the IF-MIB [RFC2863], IP Tunnel MIB [RFC4087],
   and NAT MIB [I-D.ietf-behave-nat-mib].

6.1.  The Object Group

   This Group defines objects that are needed for DS-Lite MIB.

6.1.1.  The dsliteTunnel Subtree

   The dsliteTunnel subtree describes managed objects used for managing
   tunnels in the DS-Lite scenario.  Because some objects defined in the
   IP Tunnel MIB are "not access", a few new objects are defined in DS-
   Lite MIB.

6.1.2.  The dsliteNAT Subtree

   The dsliteNAT subtree describes managed objects used for
   configuration as well as monitoring of AFTR which is capable of a NAT
   function.  Because the NAT MIB supports the NAT management function
   in DS-Lite, we may reuse it in DS-Lite MIB.  The dsliteNAT subtree
   also provides the information of mapping relationship between the
   tunnel entry and NAT entry by extending the IPv6 address of B4 to the
   natMappingTableEntry in the NAT MIB.

6.1.3.  The dsliteInfo Subtree

   The dsliteInfo subtree provides statistical information for DS-Lite.

6.2.  The Notification Group

   This group defines some notification objects for DS-Lite.

6.2.1.  The dsliteTrap Subtree

   The dsliteTrap subtree provides trap information in DS-Lite scenario.

6.3.  The Conformance Group

   The dsliteConformance subtree provides conformance information of MIB
   objects.

7.  MIB modules required for IMPORTS

   This MIB module IMPORTs objects from [RFC2578], [RFC2580], [RFC2863],
   [RFC3411], [RFC4001] and [RFC4008].

8.  Definitions

   DSLite-MIB DEFINITIONS  ::=  BEGIN

      IMPORTS
         MODULE-IDENTITY, OBJECT-TYPE, transmission,
         NOTIFICATION-TYPE,Gauge32,TimeTicks,
         Integer32, Counter64,Unsigned32
            FROM SNMPv2-SMI

         OBJECT-GROUP, MODULE-COMPLIANCE,
         NOTIFICATION-GROUP
            FROM SNMPv2-CONF

         DisplayString
            FROM SNMPv2-TC

         SnmpAdminString
            FROM SNMP-FRAMEWORK-MIB

         ifIndex
            FROM IF-MIB

        InetAddress, InetAddressType, InetAddressPrefixLength,
        InetPortNumber
              FROM INET-ADDRESS-MIB

        ProtocolNumber, NatBehaviorType,
        NatPoolingType, SubscriberIndex
             FROM NAT-MIB;

      dsliteMIB MODULE-IDENTITY
      LAST-UPDATED "201407020000Z" "201412290000Z"          -- July 02, December 29, 2014
      ORGANIZATION "IETF Softwire Working Group"
      CONTACT-INFO
         "Yu Fu
          Huawei Technologies Co., Ltd
          Huawei Building, 156 Beiqing Rd., Hai-Dian District
          Beijing, P.R. China 100095
          EMail: eleven.fuyu@huawei.com

          Sheng Jiang
          Huawei Technologies Co., Ltd
          Huawei Building, 156 Beiqing Rd., Hai-Dian District
          Beijing, P.R. China 100095
          EMail: jiangsheng@huawei.com

          Jiang Dong
          Tsinghua University
          Department of Computer Science, Tsinghua University
          Beijing  100084
          P.R. China
          Email:  knight.dongjiang@gmail.com
          Yuchi Chen
          Tsinghua University
          Department of Computer Science, Tsinghua University
          Beijing  100084
          P.R. China
          Email:  flashfoxmx@gmail.com "

      DESCRIPTION
         "The MIB module is defined for management of object in the
         DS-Lite scenario.
         Copyright (C) The Internet Society (2014).  This version
         of this MIB module is part of RFC yyyy; see the RFC itself
         for full legal notices. "
      REVISION    "201407020000Z"    "201412290000Z"
      DESCRIPTION
         "Initial version. Published as RFC xxxx."
   --RFC Ed.: RFC-edtitor pls fill in xxxx
         ::=  {  transmission xxx  }
   --RFC Ed.: assigned by IANA, see section 10 for details

   --Top level components of this MIB module

      dsliteMIBObjects OBJECT IDENTIFIER
         ::=  { dsliteMIB 1 }
      dsliteTunnel   OBJECT IDENTIFIER
         ::=  { dsliteMIBObjects 1 }

      dsliteNAT   OBJECT IDENTIFIER
         ::=  { dsliteMIBObjects 2 }

      dsliteInfo   OBJECT IDENTIFIER
         ::=  { dsliteMIBObjects 3 }

   --Notifications section

      dsliteNotifications  OBJECT IDENTIFIER
         ::=  { dsliteMIB 0 }

      dsliteTraps  OBJECT IDENTIFIER
            ::=  { dsliteNotifications 1  }

   --dsliteTunnel

   --dsliteTunnelTable

      dsliteTunnelTable OBJECT-TYPE
         SYNTAX     SEQUENCE OF DsliteTunnelEntry
         MAX-ACCESS  not-accessible
         STATUS     current
         DESCRIPTION
            "The (conceptual) table containing information on configured
             tunnels. This table can be used to map CPE address to the
             associated AFTR address. It can also be used for row
             creation."
         ::=  { dsliteTunnel 1 }

      dsliteTunnelEntry OBJECT-TYPE
         SYNTAX     DsliteTunnelEntry
         MAX-ACCESS  not-accessible
         STATUS     current
         DESCRIPTION
            "Each entry in this table contains the information on a
             particular configured tunnel."
             INDEX   { dsliteTunnelAddressType,
                       dsliteTunnelStartAddress,
                       dsliteTunnelEndAddress }
         ::=  { dsliteTunnelTable 1 }

      DsliteTunnelEntry  ::=
         SEQUENCE {
          dsliteTunnelStartAddressType    InetAddressType,
          dsliteTunnelStartAddress        InetAddress,
          dsliteTunnelStartAddPreLen      InetAddressPrefixLength,
          dsliteTunnelEndAddress          InetAddress
      }

       dsliteTunnelStartAddressType OBJECT-TYPE
          SYNTAX     InetAddressType
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
              " This object MUST be set to the value of ipv6(2).
                It describes the address type of the IPv4-in-IPv6
                tunnel startpoint and endpoint."
          ::= { dsliteTunnelEntry 1 }

      dsliteTunnelStartAddress OBJECT-TYPE
          SYNTAX     InetAddress
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
             "The address of the start point of the tunnel."
          ::= { dsliteTunnelEntry 2 }

      dsliteTunnelEndAddress OBJECT-TYPE
          SYNTAX     InetAddress
          MAX-ACCESS not-accessible
          STATUS     current
          DESCRIPTION
             "The address of the endpoint of the tunnel."
          ::= { dsliteTunnelEntry 3 }

      dsliteTunnelStartAddPreLen OBJECT-TYPE
          SYNTAX InetAddressPrefixLength
          MAX-ACCESS read-only
          STATUS current
          DESCRIPTION
             "IPv6 prefix length of the IP address of the
              start point of the tunnel."
          ::= { dsliteTunnelEntry 4 }

    --dsliteNAT
    --dsliteNATMapTable(define address pool, natPoolTable and
    --natPoolRangeTable defined in draft-ietf-behave-nat-mib
    --are sufficient)
    --dsliteNATBindTable(NAPT)

       dsliteNATBindTable OBJECT-TYPE
         SYNTAX     SEQUENCE OF DsliteNATBindEntry
         MAX-ACCESS not-accessible
         STATUS     current
         DESCRIPTION
            "This table contains information about currently
             active NAT binds in AFTR. This table extends the
             IPv6 address of B4 to the natMappingTable
             designed in NAT MIB(draft-ietf-behave-nat-mib)."
         ::=  { dsliteNAT 1 }

      dsliteNATBindEntry OBJECT-TYPE
         SYNTAX     DsliteNATBindEntry
         MAX-ACCESS not-accessible
         STATUS     current
         DESCRIPTION
            "Each entry in this table holds the relationship between
             tunnel information and nat bind information. These entries
             are lost upon agent restart."
         INDEX   { dsliteNATBindMappingProto,
                   dsliteNATBindMappingExtRealm,
                   dsliteNATBindMappingExtAddressType,
                   dsliteNATBindMappingExtAddress,
                   dsliteNATBindMappingExtPort,
                   dsliteTunnelStartAddress,
                   dsliteTunnelStartAddPreLen }
         ::=  {  dsliteNATBindTable 1   }

     DsliteNATBindEntry  ::=
         SEQUENCE {
         dsliteNATBindMappingProto          ProtocolNumber,
         dsliteNATBindMappingExtRealm       SnmpAdminString,
         dsliteNATBindMappingExtAddressType InetAddressType,
         dsliteNATBindMappingExtAddress     InetAddress,
         dsliteNATBindMappingExtPort        InetPortNumber,
         dsliteNATBindMappingIntRealm       SnmpAdminString,
         dsliteNATBindMappingIntAddressType InetAddressType,
         dsliteNATBindMappingIntAddress     InetAddress,
         dsliteNATBindMappingIntPort        InetPortNumber,
         dsliteNATBindMappingPool           Unsigned32,
         dsliteNATBindMappingMapBehavior    NatBehaviorType,
         dsliteNATBindMappingFilterBehavior NatBehaviorType,
         dsliteNATBindMappingAddressPooling NatPoolingType,
         dsliteNATBindMappingSubsIndex      SubscriberIndex
         }

      dsliteNATBindMappingProto OBJECT-TYPE
          SYNTAX      ProtocolNumber
          MAX-ACCESS  not-accessible
          STATUS      current
          DESCRIPTION
          " This object specifies the mapping's transport protocol
          number."
          ::= { dsliteNATBindEntry 1 }

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

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

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

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

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

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

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

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

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

      dsliteNATBindMappingMapBehavior OBJECT-TYPE
          SYNTAX NatBehaviorType
          MAX-ACCESS read-only
          STATUS current
          DESCRIPTION
          "Mapping behavior as described in [RFC4787] section 4.1."
          ::= { dsliteNATBindEntry 11 }

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

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

       dsliteNATBindMappingSubsIndex OBJECT-TYPE
           SYNTAX SubscriberIndex
           MAX-ACCESS read-only
           STATUS current
           DESCRIPTION
           "Subscriber using this mapping."
           ::= { dsliteNATBindEntry 14 }

      --dsliteInfo

      dsliteAFTRAlarmScalar OBJECT IDENTIFIER ::= { dsliteInfo 1 }

      dsliteAFTRAlarmB4Addr OBJECT-TYPE
         SYNTAX  InetAddress
         MAX-ACCESS accessible-for-notify
         STATUS current
         DESCRIPTION
            "This object indicate the IP address of
             B4 that send alarm "
         ::= { dsliteAFTRAlarmScalar 1 }

      dsliteAFTRAlarmProtocolType OBJECT-TYPE
         SYNTAX DisplayString
         MAX-ACCESS accessible-for-notify
         STATUS current
         DESCRIPTION
            "This object indicate the procotol type of alarm,
             0:tcp,1:udp,2:icmp,3:total "
         ::= { dsliteAFTRAlarmScalar 2 }

      dsliteAFTRAlarmSpecificIP OBJECT-TYPE
         SYNTAX InetAddress
         MAX-ACCESS accessible-for-notify
         STATUS current
         DESCRIPTION
            " This object indicate the IP address whose port usage
             reach threshold "
         ::= { dsliteAFTRAlarmScalar 3 }

      dsliteAFTRAlarmConnectNumber OBJECT-TYPE
         SYNTAX Integer32 (60..90)
         MAX-ACCESS read-write
         STATUS current
         DESCRIPTION
            " This object indicate the threshold of DS-Lite
              connections alarm."
         ::= { dsliteAFTRAlarmScalar 4 }

      dsliteStatisticTable OBJECT-TYPE
         SYNTAX SEQUENCE OF DsliteStatisticEntry
         MAX-ACCESS not-accessible
         STATUS current
         DESCRIPTION
            "This table provides statistical information
             of DS-Lite."

         ::= { dsliteInfo 2 }

      dsliteStatisticEntry OBJECT-TYPE
         SYNTAX DsliteStatisticEntry
         MAX-ACCESS not-accessible
         STATUS current
         DESCRIPTION
            "This table provides statistical information
             of DS-Lite."
         INDEX { dsliteStatisticSubscriberIdentifier }
         ::= { dsliteStatisticTable 1 }

      DsliteStatisticEntry ::=
         SEQUENCE {
       dsliteStatisticSubscriberIdex         SubscriberIndex,
       dsliteStatisticDiscard                Counter64,
       dsliteStatisticTransmitted            Counter64,
       dsliteStatisticIpv4Session            Counter64,
       dsliteStatisticIpv6Session            Counter64
      }

     dsliteStatisticSubscriberIdex OBJECT-TYPE
        SYNTAX SubscriberIndex
        MAX-ACCESS not-accessible
        STATUS current
       DESCRIPTION
           "Index of the subscriber or host.In ds-lite scenario
            This object indicate the address used for uniquely
            identifying the subscriber. It is the IPv6 address
            of B4 in DS-Lite."
         ::= { dsliteStatisticEntry 1 }

      dsliteStatisticDiscard OBJECT-TYPE
         SYNTAX Counter64
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
            " This object indicate the number of packets
              discarded from this subscriber."
        ::= { dsliteStatisticEntry 2 }

       dsliteStatisticTransmitted OBJECT-TYPE
         SYNTAX Counter64
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
            " This object indicate the number of packets received
              from or sent to this subscriber."
         ::= { dsliteStatisticEntry 3 }

      dsliteStatisticIpv4Session OBJECT-TYPE
         SYNTAX Counter64
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
            " This object indicate the number of the
              current IPv4 Session."
         ::= { dsliteStatisticEntry 4 }

      dsliteStatisticIpv6Session OBJECT-TYPE
         SYNTAX Counter64
         MAX-ACCESS read-only
         STATUS current
         DESCRIPTION
           " This object indicate the number of the
              current IPv6 Session."
        ::= { dsliteStatisticEntry 5 }

   ---dslite trap

      dsliteTunnelNumAlarm NOTIFICATION-TYPE
         OBJECTS { dsliteAFTRAlarmProtocolType,
                dsliteAFTRAlarmB4Addr }
         STATUS current
         DESCRIPTION
            "This trap is triggered when the number of
             current connecting dslite tunnel exceeds the value of
             dsliteAFTRAlarmConnectNumber."
         ::= { dsliteTraps 1 }

      dsliteAFTRUserSessionNumAlarm NOTIFICATION-TYPE
         OBJECTS { dsliteAFTRAlarmProtocolType,
                dsliteAFTRAlarmB4Addr }
         STATUS current
         DESCRIPTION
         " This trap is triggered when sessions of
           user reach the threshold."
         ::= { dsliteTraps 2 }

        dsliteAFTRPortUsageOfSpecificIpAlarm NOTIFICATION-TYPE
         OBJECTS {  dsliteAFTRAlarmSpecificIP }
         STATUS current
         DESCRIPTION
            "This trap is triggered when used NAT
             ports of map address reach the threshold."

         ::= { dsliteTraps 3 }

   --Module Conformance statement

      dsliteConformance   OBJECT IDENTIFIER
         ::=  { dsliteMIB 2 }

      dsliteCompliances OBJECT IDENTIFIER ::= { dsliteConformance 1 }

      dsliteGroups OBJECT IDENTIFIER ::= { dsliteConformance 2 }

   -- compliance statements

      dsliteCompliance MODULE-COMPLIANCE
          STATUS current
          DESCRIPTION
             " Description the minimal requirements for conformance
               to the DS-Lite MIB."
          MODULE -- this module
              MANDATORY-GROUPS { dsliteNATBindGroup,
                  dsliteTunnelGroup,
                  dsliteStatisticGroup,
                  dsliteTrapsGroup,dsliteAFTRAlarmScalarGroup }
          ::= { dsliteCompliances 1 }

      dsliteNATBindGroup OBJECT-GROUP
         OBJECTS {
                  dsliteNATBindMappingIntRealm,
                  dsliteNATBindMappingIntAddressType,
                  dsliteNATBindMappingIntAddress,
                  dsliteNATBindMappingIntPort,
                  dsliteNATBindMappingPool,
                  dsliteNATBindMappingMapBehavior,
                  dsliteNATBindMappingFilterBehavior,
                  dsliteNATBindMappingAddressPooling }
         STATUS current
         DESCRIPTION
            " The collection of this objects are used to give the
             information about NAT Bind."
          ::= { dsliteGroups 1 }

      dsliteTunnelGroup OBJECT-GROUP
         OBJECTS { dsliteTunnelStartAddPreLen }
         STATUS current
         DESCRIPTION
            " The collection of this objects are used to give the
             information of tunnel in ds-lite."
         ::= { dsliteGroups 2 }

      dsliteStatisticGroup OBJECT-GROUP
         OBJECTS { dsliteStatisticDiscard,
                   dsliteStatisticTransmitted,
                   dsliteStatisticIpv4Session,
                   dsliteStatisticIpv6Session }
        STATUS current
        DESCRIPTION
           " The collection of this objects are used to give the
             statistical information of ds-lite."
          ::= { dsliteGroups 3 }

      dsliteTrapsGroup NOTIFICATION-GROUP
         NOTIFICATIONS { dsliteTunnelNumAlarm,
                         dsliteAFTRUserSessionNumAlarm,
                         dsliteAFTRPortUsageOfSpecificIpAlarm }
         STATUS current
         DESCRIPTION
            "The collection of this objects are used to give the
             trap information of ds-lite."
         ::= { dsliteGroups 4 }

       dsliteAFTRAlarmScalarGroup OBJECT-GROUP
         OBJECTS { dsliteAFTRAlarmB4Addr, dsliteAFTRAlarmProtocolType,
              dsliteAFTRAlarmSpecificIP,
             dsliteAFTRAlarmConnectNumber }
         STATUS current
         DESCRIPTION
            " The collection of this objects are used to give the
             information about AFTR alarming Scalar."
         ::= { dsliteGroups 5 }

             END

9.  Security Considerations

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

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

      dsliteAFTRAlarmConnectNumber

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

      dsliteTunnelStartAddPreLen

      dsliteNATBindMappingIntRealm

      dsliteNATBindMappingIntAddressType

      dsliteNATBindMappingIntAddress

      dsliteNATBindMappingIntPort

      dsliteNATBindMappingPool

      dsliteNATBindMappingMapBehavior

      dsliteNATBindMappingFilterBehavior

      dsliteNATBindMappingAddressPooling

      dsliteStatisticDiscard

      dsliteStatisticTransmitted

      dsliteStatisticIpv4Session

      dsliteStatisticIpv6Session

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

   Implementations SHOULD provide the security features described by the
   SNMPv3 framework (see [RFC3410]), and implementations claiming
   compliance to the SNMPv3 standard MUST include full support for
   authentication and privacy via the User-based Security Model (USM)
   [RFC3414] with the AES cipher algorithm [RFC3826].  Implementations
   MAY also provide support for the Transport Security Model (TSM)

   [RFC5591] in combination with a secure transport such as SSH
   [RFC5592] or TLS/DTLS [RFC6353].

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

10.  IANA Considerations

   The MIB module in this document uses the following IANA-assigned
   OBJECT IDENTIFIER values recorded in the SMI Numbers registry, and
   the following IANA-assigned tunnelType values recorded in the
   IANAtunnelType-MIB registry:

         Descriptor        OBJECT IDENTIFIER value
         ----------        -----------------------
         DSLite-MIB         { transmission XXX }

         IANAtunnelType ::= TEXTUAL-CONVENTION

                    SYNTAX     INTEGER {

                               dsLite ("XX")        -- dslite tunnel

                               }

   Notes: As Appendix A of the IP Tunnel MIB[RFC4087] described that it
   has already assigned the value direct(2) to indicate the tunnel type
   is IP in IP tunnel, but it is still difficult to distinguish DS-Lite
   tunnel packets from normal IP in IP tunnel packets in the scenario of
   the AFTR connecting to both a DS-lite tunnel and an IP in IP tunnel.

11.  Acknowledgements

   The authors would like to thanks the valuable comments made by Suresh
   Krishnan, Ian Farrer, Yiu Lee, Qi Sun, Yong Cui, Dave Thaler, Tassos
   Chatzithomaoglou
   Chatzithomaoglou,David Harrington and other members of SOFTWIRE WG.

   This document was produced using the xml2rfc tool [RFC2629].

12.  References

12.1.  Normative References

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

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

   [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
              MIB", RFC 2863, June 2000.

   [RFC3411]  Harrington, D., Presuhn, R., and B. Wijnen, "An
              Architecture for Describing Simple Network Management
              Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
              December 2002.

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

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

   [RFC4087]  Thaler, D., "IP Tunnel MIB", RFC 4087, June 2005.

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

12.2.  Informative References

   [I-D.ietf-behave-nat-mib]
              Perreault, S., Tsou, T., and S. Sivakumar, "Definitions of
              Managed Objects for Network Address Translators (NAT)",
              draft-ietf-behave-nat-mib-11 (work in progress), January
              2014.

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

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

   [RFC2629]  Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
              June 1999.

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

Authors' Addresses

   Yu Fu
   Huawei Technologies Co., Ltd
   Q14, Huawei Campus, No.156 Beiqing Road
   Hai-Dian District, Beijing, 100095
   P.R. China

   Email: eleven.fuyu@huawei.com

   Sheng Jiang
   Huawei Technologies Co., Ltd
   Q14, Huawei Campus, No.156 Beiqing Road
   Hai-Dian District, Beijing, 100095
   P.R. China

   Email: jiangsheng@huawei.com

   Jiang Dong
   Tsinghua University
   Department of Computer Science, Tsinghua University
   Beijing  100084
   P.R. China

   Email: knight.dongjiang@gmail.com

   Yuchi Chen
   Tsinghua University
   Department of Computer Science, Tsinghua University
   Beijing  100084
   P.R. China

   Email: flashfoxmx@gmail.com