    Network Working Group                                        B. Haberman
    Request for Comments: 3019                               Nortel Networks
    Category: Standards Track                                    R. Worzella
                                                                         IBM
                                                                January 2001

                 IP Version 6 Management Information Base for
                   The Multicast Listener Discovery Protocol

    Status of this Memo

       This document specifies an Internet standards track protocol for the
       Internet community, and requests discussion and suggestions for
       improvements.  Please refer to the current edition of the "Internet
       Official Protocol Standards" (STD 1) for the standardization state
       and status of this protocol.  Distribution of this memo is unlimited.

    Copyright Notice

       Copyright (C) The Internet Society (2001).  All Rights Reserved.

    Abstract

       This document defines a portion of the Management Information Base
       (MIB) for use with network management protocols in Internet Protocol
       Version 6 internets.  Specifically, this document is the MIB module
       that defines managed objects for implementations of the Multicast
       Listener Discovery Protocol [RFC2710].

    Terminology

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

    1. The SNMP Management Framework

       The SNMP Management Framework presently consists of five major
       components:

       An overall architecture, described in RFC 2571 [RFC2571].

       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,

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       RFC 1155 [RFC1155], STD 16, RFC 1212 [RFC1212] and RFC 1215
       [RFC1215].  The second version, called SMIv2, is described in STD 58,
       RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
       [RFC2580].

       Message protocols for transferring management information.  The first
       version of the SNMP message protocol is called SNMPv1 and described
       in STD 15, RFC 1157 [RFC1157].  A second version of the SNMP message
       protocol, which is not an Internet standards track protocol, is
       called SNMPv2c and described in RFC 1901 [RFC1901] and RFC 1906
       [RFC1906].  The third version of the message protocol is called
       SNMPv3 and described in RFC 1906 [RFC1906], RFC 2572 [RFC2572] and
       RFC 2574 [RFC2574].

       Protocol operations for accessing management information.  The first
       set of protocol operations and associated PDU formats is described in
       STD 15, RFC 1157 [RFC1157].  A second set of protocol operations and
       associated PDU formats is described in RFC 1905 [RFC1905].

       A set of fundamental applications described in RFC 2573 [RFC2573] and
       the view-based access control mechanism described in RFC 2575
       [RFC2575].

       A more detailed introduction to the current SNMP Management Framework
       can be found in RFC 2570 [RFC2570].

       Managed objects are accessed via a virtual information store, termed
       the Management Information Base or MIB.  Objects in the MIB are
       defined using the mechanisms defined in the SMI.

       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.

    2. Overview

       This MIB module contains two tables:

          1. The MLD Interface Table, which contains one row for each
             interface on which MLD is enabled.

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          2. The MLD Cache Table which contains one row for each IPv6
             Multicast group for which there are members on a particular
             interface.

       Both tables are intended to be implemented by hosts and routers. Some
       objects in each table apply to routers only.

    3. Definitions

       IPV6-MLD-MIB DEFINITIONS ::= BEGIN

       IMPORTS
           MODULE-IDENTITY, OBJECT-TYPE, Counter32, Gauge32,
           Unsigned32, TimeTicks, mib-2     FROM SNMPv2-SMI
           RowStatus, TruthValue            FROM SNMPv2-TC
           InetAddressIPv6             FROM INET-ADDRESS-MIB
           InterfaceIndex, InterfaceIndexOrZero
                                                FROM IF-MIB
           MODULE-COMPLIANCE, OBJECT-GROUP  FROM SNMPv2-CONF;

       mldMIB MODULE-IDENTITY
           LAST-UPDATED "200101250000Z" -- 25 Jan 2001
           ORGANIZATION "IETF IPNGWG Working Group."
           CONTACT-INFO
                   " Brian Haberman
                     Nortel Networks
                     4309 Emperor Blvd.
                     Durham, NC  27703
                     USA

                     Phone: +1 919 992 4439
                     e-mail: haberman@nortelnetworks.com"
           DESCRIPTION
                   "The MIB module for MLD Management."
           REVISION "200101250000Z" -- 25 Jan 2001
           DESCRIPTION
                   "Initial version, published as RFC 3019."
           ::= { mib-2 91 }

       mldMIBObjects     OBJECT IDENTIFIER ::= { mldMIB 1 }
       --
       --  The MLD Interface Table
       --

       mldInterfaceTable OBJECT-TYPE
           SYNTAX     SEQUENCE OF MldInterfaceEntry

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           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                    "The (conceptual) table listing the interfaces on which
                    MLD is enabled."
           ::= { mldMIBObjects 1 }

       mldInterfaceEntry OBJECT-TYPE
           SYNTAX     MldInterfaceEntry
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                   "An entry (conceptual row) representing an interface on
                   which MLD is enabled."
           INDEX      { mldInterfaceIfIndex }
           ::= { mldInterfaceTable 1 }

       MldInterfaceEntry ::= SEQUENCE {
           mldInterfaceIfIndex               InterfaceIndex,
           mldInterfaceQueryInterval         Unsigned32,
           mldInterfaceStatus                RowStatus,
           mldInterfaceVersion               Unsigned32,
           mldInterfaceQuerier               InetAddressIPv6,
           mldInterfaceQueryMaxResponseDelay Unsigned32,
           mldInterfaceJoins                 Counter32,
           mldInterfaceGroups                Gauge32,
           mldInterfaceRobustness            Unsigned32,
           mldInterfaceLastListenQueryIntvl  Unsigned32,
           mldInterfaceProxyIfIndex          InterfaceIndexOrZero,
           mldInterfaceQuerierUpTime         TimeTicks,
           mldInterfaceQuerierExpiryTime     TimeTicks
       }

       mldInterfaceIfIndex OBJECT-TYPE

           SYNTAX     InterfaceIndex
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                   "The internetwork-layer interface value of the interface
                   for which MLD is enabled."
           ::= { mldInterfaceEntry 1 }

       mldInterfaceQueryInterval OBJECT-TYPE
           SYNTAX     Unsigned32
           UNITS      "seconds"
           MAX-ACCESS read-create
           STATUS     current

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           DESCRIPTION
                   "The frequency at which MLD Host-Query packets are
                   transmitted on this interface."
           DEFVAL     { 125 }
           ::= { mldInterfaceEntry 2 }

       mldInterfaceStatus OBJECT-TYPE
           SYNTAX     RowStatus
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                    "The activation of a row enables MLD on the interface.
                    The destruction of a row disables MLD on the interface."
           ::= { mldInterfaceEntry 3 }

       mldInterfaceVersion OBJECT-TYPE
           SYNTAX     Unsigned32
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                    "The version of MLD which is running on this interface.
                    This object is a place holder to allow for new versions
                    of MLD to be introduced.  Version 1 of MLD is defined
                    in RFC 2710."
           DEFVAL     { 1 }
           ::= { mldInterfaceEntry 4 }

       mldInterfaceQuerier OBJECT-TYPE
           SYNTAX     InetAddressIPv6 (SIZE (16))
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                    "The address of the MLD Querier on the IPv6 subnet to
                    which this interface is attached."
           ::= { mldInterfaceEntry 5 }

       mldInterfaceQueryMaxResponseDelay OBJECT-TYPE
           SYNTAX     Unsigned32
           UNITS      "seconds"
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                   "The maximum query response time advertised in MLD
                   queries on this interface."
           DEFVAL     { 10 }
           ::= { mldInterfaceEntry 6 }

       mldInterfaceJoins OBJECT-TYPE

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           SYNTAX     Counter32
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                   "The number of times a group membership has been added on
                   this interface; that is, the number of times an entry for
                   this interface has been added to the Cache Table.  This
                   object gives an indication of the amount of MLD activity
                   over time."
           ::= { mldInterfaceEntry 7 }

       mldInterfaceGroups OBJECT-TYPE
           SYNTAX     Gauge32
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                   "The current number of entries for this interface in the
                   Cache Table."
           ::= { mldInterfaceEntry 8 }

       mldInterfaceRobustness OBJECT-TYPE
           SYNTAX     Unsigned32
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                   "The Robustness Variable allows tuning for the expected
                   packet loss on a subnet.  If a subnet is expected to be
                   lossy, the Robustness Variable may be increased.  MLD is
                   robust to (Robustness Variable-1) packet losses.  The
                   discussion of the Robustness Variable is in Section 7.1
                   of RFC 2710."
           DEFVAL     { 2 }
           ::= { mldInterfaceEntry 9 }

       mldInterfaceLastListenQueryIntvl OBJECT-TYPE
           SYNTAX     Unsigned32
           UNITS      "seconds"
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                    "The Last Member Query Interval is the Max Response
                    Delay inserted into Group-Specific Queries sent in
                    response to Leave Group messages, and is also the amount
                    of time between Group-Specific Query messages.  This
                    value may be tuned to modify the leave latency of the
                    network.  A reduced value results in reduced time to
                    detect the loss of the last member of a group."
           DEFVAL     { 1 }

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           ::= { mldInterfaceEntry 10 }

       mldInterfaceProxyIfIndex OBJECT-TYPE
           SYNTAX     InterfaceIndexOrZero
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                    "Some devices implement a form of MLD proxying whereby
                    memberships learned on the interface represented by this
                    row, cause MLD Multicast Listener Reports to be sent on
                    the internetwork-layer interface identified by this
                    object.  Such a device would implement mldRouterMIBGroup
                    only on its router interfaces (those interfaces with
                    non-zero mldInterfaceProxyIfIndex).  Typically, the
                    value of this object is 0, indicating that no proxying
                    is being done."
           DEFVAL     { 0 }
           ::= { mldInterfaceEntry 11 }

       mldInterfaceQuerierUpTime OBJECT-TYPE
           SYNTAX     TimeTicks
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                   "The time since mldInterfaceQuerier was last changed."
           ::= { mldInterfaceEntry 12 }

       mldInterfaceQuerierExpiryTime OBJECT-TYPE
           SYNTAX     TimeTicks
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                   "The time remaining before the Other Querier Present
                   Timer expires.  If the local system is the querier,
                   the value of this object is zero."
           ::= { mldInterfaceEntry 13 }

       --
       --  The MLD Cache Table
       --

       mldCacheTable OBJECT-TYPE
           SYNTAX     SEQUENCE OF MldCacheEntry
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                    "The (conceptual) table listing the IPv6 multicast

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                    groups for which there are members on a particular
                    interface."
           ::= { mldMIBObjects 2 }

       mldCacheEntry OBJECT-TYPE
           SYNTAX     MldCacheEntry
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                   "An entry (conceptual row) in the mldCacheTable."
           INDEX      { mldCacheAddress, mldCacheIfIndex }
           ::= { mldCacheTable 1 }

       MldCacheEntry ::= SEQUENCE {
           mldCacheAddress         InetAddressIPv6,
           mldCacheIfIndex            InterfaceIndex,
           mldCacheSelf               TruthValue,
           mldCacheLastReporter   InetAddressIPv6,
           mldCacheUpTime             TimeTicks,
           mldCacheExpiryTime         TimeTicks,
           mldCacheStatus             RowStatus
       }

       mldCacheAddress OBJECT-TYPE
           SYNTAX     InetAddressIPv6 (SIZE (16))
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                   "The IPv6 multicast group address for which this entry
                   contains information."
           ::= { mldCacheEntry 1 }

       mldCacheIfIndex OBJECT-TYPE
           SYNTAX     InterfaceIndex
           MAX-ACCESS not-accessible
           STATUS     current
           DESCRIPTION
                    "The internetwork-layer interface for which this entry
                    contains information for an IPv6 multicast group
                    address."
           ::= { mldCacheEntry 2 }

       mldCacheSelf OBJECT-TYPE
           SYNTAX     TruthValue
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                   "An indication of whether the local system is a member of

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                   this group address on this interface."
           DEFVAL     { true }
           ::= { mldCacheEntry 3 }

       mldCacheLastReporter OBJECT-TYPE
           SYNTAX     InetAddressIPv6 (SIZE (16))
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                    "The IPv6 address of the source of the last membership
                    report received for this IPv6 Multicast group address on
                    this interface.  If no membership report has been
                    received, this object has the value 0::0."
           ::= { mldCacheEntry 4 }

       mldCacheUpTime OBJECT-TYPE
           SYNTAX     TimeTicks
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                   "The time elapsed since this entry was created."
           ::= { mldCacheEntry 5 }

       mldCacheExpiryTime OBJECT-TYPE
           SYNTAX     TimeTicks
           MAX-ACCESS read-only
           STATUS     current
           DESCRIPTION
                    "The minimum amount of time remaining before this entry
                    will be aged out.  A value of 0 indicates that the entry
                    is only present because mldCacheSelf is true and that if
                    the router left the group, this entry would be aged out
                    immediately.  Note that some implementations may process
                    Membership Reports from the local system in the same way
                    as reports from other hosts, so a value of 0 is not
                    required."
           ::= { mldCacheEntry 6 }

       mldCacheStatus OBJECT-TYPE
           SYNTAX     RowStatus
           MAX-ACCESS read-create
           STATUS     current
           DESCRIPTION
                   "The status of this row, by which new entries may be
                   created, or existing entries deleted from this table."
           ::= { mldCacheEntry 7 }

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       -- conformance information

       mldMIBConformance
                      OBJECT IDENTIFIER ::= { mldMIB 2 }
       mldMIBCompliances
                      OBJECT IDENTIFIER ::= { mldMIBConformance 1 }
       mldMIBGroups
                      OBJECT IDENTIFIER ::= { mldMIBConformance 2 }

       -- compliance statements

       mldHostMIBCompliance MODULE-COMPLIANCE
           STATUS  current
           DESCRIPTION
                   "The compliance statement for hosts running MLD and
                   implementing the MLD MIB."
           MODULE  -- this module
           MANDATORY-GROUPS { mldBaseMIBGroup,
                              mldHostMIBGroup
                            }

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

           ::= { mldMIBCompliances 1 }

       mldRouterMIBCompliance MODULE-COMPLIANCE
           STATUS  current
           DESCRIPTION
                   "The compliance statement for routers running MLD and
                   implementing the MLD MIB."
           MODULE  -- this module
           MANDATORY-GROUPS { mldBaseMIBGroup,
                              mldRouterMIBGroup
                            }

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

           ::= { mldMIBCompliances 2 }

       -- units of conformance

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       mldBaseMIBGroup OBJECT-GROUP
           OBJECTS { mldCacheSelf,
                     mldCacheStatus, mldInterfaceStatus
                   }
           STATUS  current
           DESCRIPTION
                   "The basic collection of objects providing management of
                   MLD.  The mldBaseMIBGroup is designed to allow for the
                   manager creation and deletion of MLD cache entries."
           ::= { mldMIBGroups 1 }

       mldRouterMIBGroup OBJECT-GROUP
           OBJECTS { mldCacheUpTime, mldCacheExpiryTime,
                     mldInterfaceQueryInterval,
                     mldInterfaceJoins, mldInterfaceGroups,
                     mldCacheLastReporter,
                     mldInterfaceQuerierUpTime,
                     mldInterfaceQuerierExpiryTime,
                     mldInterfaceQuerier,
                     mldInterfaceVersion,
                     mldInterfaceQueryMaxResponseDelay,
                     mldInterfaceRobustness,
                     mldInterfaceLastListenQueryIntvl
                   }
           STATUS  current
           DESCRIPTION
                   "A collection of additional objects for management of MLD
                   in routers."
           ::= { mldMIBGroups 2 }

       mldHostMIBGroup OBJECT-GROUP
           OBJECTS { mldInterfaceQuerier
                   }
           STATUS  current
           DESCRIPTION
                   "A collection of additional objects for management of MLD
                   in hosts."
           ::= { mldMIBGroups 3 }

       mldProxyMIBGroup OBJECT-GROUP
           OBJECTS { mldInterfaceProxyIfIndex }
           STATUS  current
           DESCRIPTION
                   "A collection of additional objects for management of MLD
                   proxy devices."

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           ::= { mldMIBGroups 4 }

       END

    Security Considerations

       This MIB contains readable objects whose values provide information
       related to multicast sessions.  Some of these objects could contain
       sensitive information.  In particular, the mldCacheSelf and
       mldCacheLastReporter could be used to identify machines which are
       listening to a given group address.  There are also a number of
       objects that have a MAX-ACCESS clause of read-write and/or read-
       create, which allow an administrator to configure MLD in the router.

       While unauthorized access to the readable objects is relatively
       innocuous, unauthorized access to the write-able objects could cause
       a denial of service.  Hence, the support of SET operations in a non-
       secure environment without proper protection can have a negative
       effect on network operations.

       SNMPv1 by itself is such an insecure environment.  Even if the
       network itself is secure (for example by using IPSec), even then,
       there is no control as to who on the network is allowed to access and
       SET (change/create/delete) the objects in this MIB.

       It is recommended that the implementers consider the security
       features as provided by the SNMPv3 framework.  Specifically, the use
       of the User-based Security Model RFC 2574 [RFC2574] and the View-
       based Access Control Model RFC 2575 [RFC2575] is recommended.

       It is then a customer/user responsibility to ensure that the SNMP
       entity giving access to this MIB, is properly configured to give
       access to those objects only to those principals (users) that have
       legitimate rights to access them.

    Acknowledgements

       This MIB module is based on the IGMP MIB authored by Keith
       McCloghrie, Dino Farinacci, and Dave Thaler.  It was updated based on
       feedback from the IPNGWG working group, Bert Wijnen, Peder Norgaard,
       and extensive comments from Juergen Schoenwaelder.

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    References

       [RFC2710] Deering, S., Fenner, W. and B. Haberman, "Multicast
                 Listener Discovery (MLD) for IPv6", RFC 2710, October 1999.

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

       [RFC2571] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture
                 for Describing SNMP Management Frameworks", RFC 2571, April
                 1999.

       [RFC1155] Rose, M. and K. McCloghrie, "Structure and Identification
                 of Management Information for TCP/IP-based Internets", STD
                 16, RFC 1155, May 1990.

       [RFC1212] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD
                 16, RFC 1212, March 1991.

       [RFC1215] Rose, M., "A Convention for Defining Traps for use with the
                 SNMP", RFC 1215, March 1991.

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

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

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

       [RFC1157] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
                 Network Management Protocol", STD 15, RFC 1157, May 1990.

       [RFC1901] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser,
                 "Introduction to Community-based SNMPv2", RFC 1901, January
                 1996.

       [RFC1906] 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.

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    RFC 3019                      MIB for MLD                   January 2001

       [RFC2572] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
                 Processing and Dispatching for the Simple Network
                 Management Protocol (SNMP)", RFC 2572, April 1999.

       [RFC2574] Blumenthal, U. and B. Wijnen, "User-based Security Model
                 (USM) for version 3 of the Simple Network Management
                 Protocol (SNMPv3)", RFC 2574, April 1999.

       [RFC1905] 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.

       [RFC2573] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications",
                 RFC 2573, April 1999.

       [RFC2575] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based
                 Access Control Model (VACM) for the Simple Network
                 Management Protocol (SNMP)", RFC 2575, April 1999.

       [RFC2570] Case, J., Mundy, R., Partain, D. and B. Stewart,
                 "Introduction to Version 3 of the Internet-standard Network
                 Management Framework", RFC 2570, April 1999.

    Authors' Addresses

       Brian Haberman
       Nortel Networks
       4309 Emperor Blvd.
       Suite 200
       Durham, NC  27703
       USA

       Phone: +1-919-992-4439
       EMail: haberman@nortelnetworks.com

       Randy Worzella
       IBM Corporation
       800 Park Office Drive
       Research Triangle Park, NC  27709
       USA

       Phone: +1-919-254-2202
       EMail: worzella@us.ibm.com

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    Full Copyright Statement

       Copyright (C) The Internet Society (2001).  All Rights Reserved.

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

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

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

    Acknowledgement

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

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