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IPv4 Service Continuity Prefix
draft-ietf-v6ops-clatip-00

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 7335.
Author Cameron Byrne
Last updated 2014-05-07 (Latest revision 2014-05-05)
Replaces draft-byrne-v6ops-clatip
RFC stream Internet Engineering Task Force (IETF)
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Stream WG state WG Document
Document shepherd Fred Baker
IESG IESG state Became RFC 7335 (Proposed Standard)
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draft-ietf-v6ops-clatip-00
INTERNET-DRAFT                                             Cameron Byrne
Intended Status: Informational                               T-Mobile US
Expires: November 6, 2014                                    May 5, 2014

                    IPv4 Service Continuity Prefix 
                       draft-ietf-v6ops-clatip-00

Abstract

   DS-Lite, defined in RFC 6333,  directs IANA to reserve 192.0.0.0/29
   for the B4 element.  This memo directs IANA to generalize that
   reservation to include other cases where a non-routed IPv4 interface
   must be numbered as part of an IPv6 transition solution.

Status of this Memo

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

   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/1id-abstracts.html

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

Copyright and License Notice

   Copyright (c) 2014 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  The Case of 464XLAT . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Choosing 192.0.0.0/29  . . . . . . . . . . . . . . . . . . . .  3
   4  Security Considerations . . . . . . . . . . . . . . . . . . . .  3
   5  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  4
   6  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . .  4
   7  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     7.1  Normative References  . . . . . . . . . . . . . . . . . . .  4
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  4

 

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1  Introduction

   DS-Lite [RFC6333] directs IANA to reserve 192.0.0.0/29 for the B4
   element.  This memo generalizes that IANA reservation to include
   other cases where a non-routed IPv4 interface must be numbered in an
   IPv6 transition solution.  IANA shall list the address block
   192.0.0.0/29 reserved for IPv4 Service Continuity Prefix.  The result
   is that 192.0.0.0/29 may be used in any system that requires IPv4
   addresses for backward compatibility with IPv4 communications in an
   IPv6-only network, but does not emit IPv4 packets "on the wire".

2  The Case of 464XLAT

   464XLAT [RFC6877] describes an architecture for providing IPv4
   communication over an IPv6-only access network.  One of the methods
   described in [RFC6877] is for the client side translator (CLAT) to be
   embedded in the host, such as a smartphone.  In this scenario, the
   host must have an IPv4 address configured to present to the host
   network stack and for applications to bind sockets.

3.  Choosing 192.0.0.0/29

   To avoid conflicts with any other network that may communicate with
   the CLAT or other IPv6 transition solution, a locally unique IPv4
   address must be assigned.

   IANA has defined a well-known range, 192.0.0.0/29, in [RFC6333],
   which is dedicated for DS-lite.  As defined in [RFC6333], this subnet
   is only present between the B4 and the AFTR and never emits packets
   from this prefix "on the wire".  464XLAT has the same need for a non-
   routed IPv4 prefix, and this same need may be common for other
   similar solutions.  It is most prudent and effective to generalize
   192.0.0.0/29 for the use of supporting IPv4 interfaces in IPv6
   transition technologies rather than reserving a prefix for every
   possible solution.

   With this memo, 192.0.0.0/29 is now generalized across multiple IPv4
   continuity solutions such as 464XLAT and DS-lite.  It is important
   that a host never be deployed with 2 active IPv4 continuity solutions
   simultaneously in a way that would cause a node to have overlapping
   address from 192.0.0.0/29.  

4  Security Considerations

   No new security considerations beyond what is described [RFC6333] and
   [RFC6877].

 

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5  IANA Considerations

   IANA is directed to generalize the reservation of 192.0.0.0/29 from
   DS-lite to "IPv4 Service Continuity Prefix".

6  Acknowledgements

   This document has been substantially improved by specific feedback
   from Dave Thaler, Fred Baker, Wes George, Lorenzo Colitti, and
   Mohamed Boucadair.

7  References

7.1  Normative References

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

   [RFC6877]  Mawatari, M., Kawashima, M., and C. Byrne, "464XLAT:
              Combination of Stateful and Stateless Translation",
              RFC6877, April 2013.

Authors' Addresses

              Cameron Byrne
              Bellevue, WA, USA
              Email: Cameron.Byrne@T-Mobile.com

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