IPv4 Residual Deployment via IPv6 - a Stateless Solution (4rd)
draft-ietf-softwire-4rd-07

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Last updated 2013-10-07
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Internet Engineering Task Force                               R. Despres
Internet-Draft                                                 RD-IPtech
Intended status: Experimental                              S. Jiang, Ed.
Expires: April 11, 2014                     Huawei Technologies Co., Ltd
                                                                R. Penno
                                                     Cisco Systems, Inc.
                                                                  Y. Lee
                                                                 Comcast
                                                                 G. Chen
                                                            China Mobile
                                                                 M. Chen
                                                        Freebit Co, Ltd.
                                                        October 08, 2013

     IPv4 Residual Deployment via IPv6 - a Stateless Solution (4rd)
                       draft-ietf-softwire-4rd-07

Abstract

   The 4rd automatic tunneling mechanism makes IPv4 Residual Deployment
   possible via IPv6 networks without maintaining for this per-customer
   states in 4rd-capable nodes (reverse of the IPv6 Rapid Deployment of
   6rd).  To cope with the IPv4 address shortage, customer sites can be
   assigned shared public IPv4 addresses with restricted port sets. 4rd
   can also support the scenarios that customer sites are assigned full
   public IPv4 addresses or a set of public IPv4 addresses.

Status of This Memo

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   This Internet-Draft will expire on April 11, 2014.

Copyright Notice

Despres, et al.          Expires April 11, 2014                 [Page 1]
Internet-Draft  Stateless IPv4 Residual Deployment (4rd)    October 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  The 4rd Model . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Protocol Specifications . . . . . . . . . . . . . . . . . . .   7
     4.1.  NAT44 on CE . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Mapping rules and other Domain parameters . . . . . . . .   8
     4.3.  Reversible Packet Translations at Domain entries and
           exits . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.4.  Address Mapping from CE IPv6 Prefixes to 4rd IPv4
           prefixes  . . . . . . . . . . . . . . . . . . . . . . . .  13
     4.5.  Address Mapping from 4rd IPv4 addresses to 4rd IPv6
           Addresses . . . . . . . . . . . . . . . . . . . . . . . .  15
     4.6.  Fragmentation Processing  . . . . . . . . . . . . . . . .  19
       4.6.1.  Fragmentation at Domain Entry . . . . . . . . . . . .  19
       4.6.2.  Ports of Fragments addressed to Shared-Address CEs  .  19
       4.6.3.  Packet Identifications from Shared-Address CEs  . . .  21
     4.7.  TOS and Traffic-Class Processing  . . . . . . . . . . . .  21
     4.8.  Tunnel-Generated ICMPv6 Error Messages  . . . . . . . . .  22
     4.9.  Provisioning 4rd Parameters to CEs  . . . . . . . . . . .  22
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  25
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   7.  Relationship with Previous Works  . . . . . . . . . . . . . .  26
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  27
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  27
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