Learning NAT64 PREFIX64s using Port Control Protocol (PCP)
draft-ietf-pcp-nat64-prefix64-05

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PCP Working Group                                           M. Boucadair
Internet-Draft                                            France Telecom
Intended status: Standards Track                       February 04, 2014
Expires: August 8, 2014

       Learning NAT64 PREFIX64s using Port Control Protocol (PCP)
                    draft-ietf-pcp-nat64-prefix64-05

Abstract

   This document defines a new Port Control Protocol (PCP) option to
   learn the IPv6 prefix(es) used by a PCP-controlled NAT64 device to
   build IPv4-converted IPv6 addresses.  This option 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.

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   This Internet-Draft will expire on August 8, 2014.

Copyright 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Issues  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   3
       3.2.1.  AAAA Synthesis by the DNS Stub-resolver . . . . . . .   3
       3.2.2.  Application Referrals . . . . . . . . . . . . . . . .   4
   4.  PREFIX64 Option . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Format  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Server's Behavior . . . . . . . . . . . . . . . . . . . .   7
     4.3.  Client's Behavior . . . . . . . . . . . . . . . . . . . .   8
   5.  Flow Examples . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  TCP Session Initiated from an IPv6-only Host  . . . . . .   9
     5.2.  SIP Flow Example  . . . . . . . . . . . . . . . . . . . .  10
     5.3.  Mapping of IPv4 Address Ranges to IPv6 Prefixes . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   According to [RFC6146], NAT64 uses Pref64::/n to construct
   IPv4-Converted IPv6 addresses as defined in [RFC6052].

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

   This PCP option is a deterministic solution to help establish
   communications between IPv6-only hosts and remote IPv4-only hosts.
   Unlike [RFC7050], this option solves all the issues identified in
   [RFC7051].

   Some illustration examples are provided in Section 5.  Detailed
   experiments conducted to assess the applicability of the PREFIX64
   option for services, such as access to a video server behind NAT64
   and SIP-based sessions, are available at
   [I-D.boucadair-pcp-nat64-experiments].

   The use of this PCP option for NAT64 load balancing purposes is out
   of scope.

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