PREFIX64 PCP Option for NAT64
draft-boucadair-pcp-nat64-prefix64-option-00

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Network Working Group                                       M. Boucadair
Internet-Draft                                            France Telecom
Intended status: Standards Track                       September 6, 2012
Expires: March 10, 2013

                     PREFIX64 PCP Option for NAT64
              draft-boucadair-pcp-nat64-prefix64-option-00

Abstract

   This document defines a new PCP option to learn the Prefix64 used by
   a PCP-controlled NAT64 device to build IPv4-embedded IPv6 addresses.
   This option is needed for successful communications when IPv4
   addresses are used in referrals (e.g., SIP).

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
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   This Internet-Draft will expire on March 10, 2013.

Copyright Notice

   Copyright (c) 2012 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
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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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . . . 4
   3.  PREFIX64 Option . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.1.  Format  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Behaviour . . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 7
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 8

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1.  Introduction

   This document defines a new PCP option [I-D.ietf-pcp-base] to inform
   PCP Clients about the Prefix64 [RFC6052] used by a PCP-controlled
   NAT64 device [RFC6146].

   This option is required to help establishing communications between
   IPv6-only hosts and remote IPv4-hosts.  An illustration example is
   shown in Figure 1.  In this example, NAT64 is co-located with a PCP
   server while IPv6-only SIP UA interacts with a PCP Client.

   In Figure 1, the PCP Client issues a PCP MAP request with
   PORT_RESERVATION_OPTION to reserve a pair of ports preserving parity
   and contiguity [I-D.boucadair-pcp-rtp-rtcp].  A pair of ports and an
   external IPv4 address are then returned by the PCP server to the
   requesting PCP Client.  This information is used by the IPv6-only SIP
   UA to build its SDP offer which contains exclusively IPv4 addresses
   (especially in the "c=" line, the port indicated for media port is
   the external port assigned by the PCP server).  The INVITE request
   including the SDP offer is then forwarded by the NAT64 to the Proxy
   Server which will relay it to the called party (i.e., IPv4-only SIP
   UA) (Steps (1) to (3)).  IPv4-only SIP UA accepts the offer and sends
   back its SDP answer in a "200 OK" message which is relayed by the SIP
   Proxy Server and NAT64 until being delivered to IPv6-only SIP UA
   (Steps (4) to (6)).  At the end of this process, IPv4-only SIP UA can
   send media streams to the IPv4 address/port as indicated in the SDP