Learn NAT64 PREFIX64s using PCP
draft-ietf-pcp-nat64-prefix64-01

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Document Type Active Internet-Draft (pcp WG)
Last updated 2013-05-22
Replaces draft-boucadair-pcp-nat64-prefix64-option
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PCP Working Group                                           M. Boucadair
Internet-Draft                                            France Telecom
Intended status: Standards Track                            May 22, 2013
Expires: November 23, 2013

                    Learn NAT64 PREFIX64s using PCP
                    draft-ietf-pcp-nat64-prefix64-01

Abstract

   This document defines a new PCP extension to learn the IPv6
   prefix(es) used by a PCP-controlled NAT64 device to build
   IPv4-embedded IPv6 addresses.  This extension is needed for
   successful communications when IPv4 addresses are used in referrals.

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 November 23, 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   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.

Boucadair              Expires November 23, 2013                [Page 1]
Internet-Draft                PCP & NAT64                       May 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Issues  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   3
       3.2.1.  AAAA Synthesis by Stub-resolver . . . . . . . . . . .   3
       3.2.2.  Applications Referrals  . . . . . . . . . . . . . . .   3
   4.  PREFIX64 Option . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Format  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Behavior  . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Flow Examples . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  TCP Session Initiated from an IPv6-only Host  . . . . . .   6
     5.2.  SIP Flow Example  . . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   This document defines a new PCP extension [RFC6887] to inform PCP
   clients about the Pref64::/n [RFC6052] used by a PCP-controlled NAT64
   device [RFC6146].  It does so by defining a new PREFIX64 option.

   This extension is required to help establishing communications
   between IPv6-only hosts and remote IPv4-only hosts.

   Some illustration examples are provided in Section 5.  Detailed
   experiment results are available at
   [I-D.boucadair-pcp-nat64-experiments].

   The use of this PCP extension for NAT64 load balancing purposes
   ([I-D.zhang-behave-nat64-load-balancing]) is out of scope.

2.  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 [RFC2119].

3.  Problem Statement

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