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Network Working Group                                       N. Matsuhira
Internet-Draft                                           Fujitsu Limited
Intended status: Experimental                             March 30, 2013
Expires: October 1, 2013


                        SA46T Multicast Support
                     draft-matsuhira-sa46t-mcast-03

Abstract

   This document describe Stateless Automatic IPv4 over IPv6
   Encapsulation / Decapsutation Technology (SA46T) multicast support.
   IPv4 multicast is supported by SA46T with same manner with IPv4
   unicast.  SA46T multicast address prefix is defined.

Requirements Language

   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 RFC 2119 [RFC2119].

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 October 1, 2013.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents



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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Architecture of SA46T Multicast . . . . . . . . . . . . . . . . 3
   3.  Format of SA46T Multicast address . . . . . . . . . . . . . . . 5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 7
     7.2.  References  . . . . . . . . . . . . . . . . . . . . . . . . 7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 7
































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1.  Introduction

   This document describe Stateless Automatic IPv4 over IPv6
   Encapsulation / Decapsulation Technology (SA46T) multicast support.

   SA46T [I-D.draft-matsuhira-sa46t-spec] makes backbone network to IPv6
   only.  And also, SA46T can stack many IPv4 networks, i.e. the
   networks using same IPv4 (private) address, without interdependence.

   IPv4 multicast is supported by SA46T with same manner with IPv4
   unicast.


2.  Architecture of SA46T Multicast

   IPv4 multicast address is knows as Class D IPv4 address, 224.0.0.0/4.
   The range is from 224.0.0.0 to 239.255.255.255.

   Mapping IPv4 multicast address to IPv6 addressing space, the IPv6
   address which mapped to IPv4 mapped address is also IPv6 multicast
   address space, because copy of the packet for multicasting may occuer
   not only in IPv4 subnet but also in IPv6 backbone.  So, SA46T
   multicast support require special IPv6 address prefix, SA46T
   multicast address prefix.

   Figure 1 show address architecutire of SA46T and SA46T multicast
   support.  Both unicast case and multicast case, mapping IPv4 address
   is the same, and usage of IPv4 network plane ID is the same, however,
   SA46T address prefix (unicast) and SA46T multicast address prefix is
   not the same.  If value of IPv4 network plane ID is the same, IPv4
   unicast address and IPv4 multicast address belong the same network
   plane.

   In this document, SA46T unicast address which contain IPv4 unicast
   address, and SA46T multicast address which contain IPv4 multicast
   address are used.















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    |<------------------------ 128 bits ----------------------------->|
    |<-------------------- 96 bits ------------------->|<-- 32 bits ->|
    |                                                                 |
    |                                                                 |
    |                                                  +--------------+
    |                                                  | IPv4 address |
    |                                                  +--------------+
    |                                                  |              |
    |      96 - m bits      |          m bits          |   32 bits    |
    +-----------------------+--------------------------+--------------+
    | SA46T address prefix  |  IPv4 network plane ID   | IPv4 address |
    |  ( unicast )          |                          | (unicast)    |
    +-----------------------+--------------------------+--------------+
    |                       |                          |              |
    +-----------------------+--------------------------+--------------+
    | SA46T multicast       |  IPv4 network plane ID   | IPv4 address |
    |  address prefix       |                          | (multicast)  |
    +-----------------------+--------------------------+--------------+


                                 Figure 1

   Figure 2 show the format of SA46T multicast address prefix.  IPv6
   multicast address has a prefix of FF00::/8.  SA46T multicast address
   prefix should be the same with IPv6 multicast address prefix.

   A group ID part of IPv6 multicast address is mapped with reserve
   space, IPv4 network plane ID, and IPv4 (multicast) address.























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                                                    | 4  |  28        |
                                                    +----+------------+
                                                    |1110|            |
                                                    +----+------------+
                                                    | IPv4 multicast  |
                                                    | address         |
    |                                               |                 |
    +-------------------------------+---------------+-----------------+
    |SA46T multicast address plefix | IPv4 plane ID | IPv4 address    |
    +-------------------------------+---------------+-----------------+

    |   8    |  4 |  4 |112 - m - 32|       m       |       32        |
    +------ -+----+----+----------------------------------------------+
    |11111111|flgs|scop|     rsv    | IPv4 plane ID | IPv4 address    |
    +--------+----+----+----------------------------------------------+
    :        :    :    :                                              :
    :        :    :    :                                              :
    |   8    |  4 |  4 |                  112 bits                    |
    +--------+----+----+----------------------------------------------+
    |11111111|flgs|scop|                   group ID                   |
    +--------+----+----+----------------------------------------------+


                                 Figure 2

   The information which indicate SA46T multicast address is needed,
   because there is a possibility the value of group ID for IPv6
   multicast and the value of "rsv+IPv4 network plane ID + IPv4
   multicast addres" is the same.

   This information is TBD.

   However, this version of this document supporse using flag space.
   The flag space consists four flags (bits), and high-order 3 flags are
   reserced, and 4th flag is T, which indicate the address is
   permanently-assinged (well-known) or non-parmanently-assinged
   (transient).

   There is a idea, which allocate SA46T multicast address flag in flag
   space, and using scop space also other idea, too


3.  Format of SA46T Multicast address

   This example is based on IPv6 Global Unicast Address Format
   [RFC3587].

   Figure 3 shows IPv6 Global Unicast Address Format.



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    | 3 |        45bits         |  16bits   |        64bits            |
    +---+-----------------------+-----------+--------------------------+
    |001| Global routing prefix | subnet id |  Interface ID            |
    +---+-----------------------+-----------+--------------------------+

                                 Figure 3

   Figure 4 shows SA46T multicast address format using part of IPv6
   Global Unicast Address.


    | 3 |        45bits         |  16bits   |   32bits  |   32bits     |
    +---+-----------------------+-----------+--------------------------+
    |001| Global routing prefix | subnet id |  plane ID | IPv4 address |
    +---+-----------------------+-----------+--------------------------+
    <---SA46T address prefix--------------->


    |   8    |  4 |  4 |         48         |    32     |      32      |
    +------=-+----+----+--------------------+-----------+--------------+
    |11111111|flgs|scop|     rsv            |  plane ID | IPv4 address |
    +--------+----+----+--------------------+-----------+--------------+
    <---SA46T multicast address prefix----->



                                 Figure 4


4.  IANA Considerations

   This document may make request of IANA.


5.  Security Considerations

   SA46T use automatic encapsulation technologies.  Security
   consideration related tunneling technologies are discussed in
   RFC2893[RFC2893], RFC2267[RFC2267], etc.


6.  Acknowledgements


7.  References






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7.1.  Normative References

   [I-D.draft-matsuhira-sa46t-spec]
              Matsuhira, N., "Stateless Automatic IPv4 over IPv6
              Encapsulation / Decapsulation Technology: Specification",
              January 2012.

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

   [RFC3587]  Hinden, R., Deering, S., and E. Nordmark, "IPv6 Global
              Unicast Address Format", RFC 3587, August 2003.

7.2.  References

   [RFC2267]  Ferguson, P. and D. Senie, "Network Ingress Filtering:
              Defeating Denial of Service Attacks which employ IP Source
              Address Spoofing", RFC 2267, January 1998.

   [RFC2893]  Gilligan, R. and E. Nordmark, "Transition Mechanisms for
              IPv6 Hosts and Routers", RFC 2893, August 2000.


Author's Address

   Naoki Matsuhira
   Fujitsu Limited
   1-1, Kamikodanaka 4-chome, Nakahara-ku
   Kawasaki,   211-8588
   Japan

   Phone: +81-44-754-3466
   Fax:
   Email: matsuhira@jp.fujitsu.com

















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