Discovery of IPv6 Prefix Used for IPv6 Address Synthesis
draft-ietf-behave-nat64-discovery-heuristic-11

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Document Type Active Internet-Draft (behave WG)
Last updated 2012-07-30
Replaces draft-savolainen-heuristic-nat64-discovery
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Behave WG                                                  T. Savolainen
Internet-Draft                                                     Nokia
Intended status: Standards Track                             J. Korhonen
Expires: January 31, 2013                         Nokia Siemens Networks
                                                                 D. Wing
                                                           Cisco Systems
                                                           July 30, 2012

        Discovery of IPv6 Prefix Used for IPv6 Address Synthesis
           draft-ietf-behave-nat64-discovery-heuristic-11.txt

Abstract

   This document describes a method for detecting the presence of DNS64
   and for learning the IPv6 prefix used for protocol translation on an
   access network.  The method depends on the existence of a well-known
   IPv4-only domain name "ipv4only.arpa".  The information learned
   enables nodes to perform local IPv6 address synthesis and to
   potentially avoid NAT64 on dual-stack and multi-interface
   deployments.

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 January 31, 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
   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.  Requirements and Terminology . . . . . . . . . . . . . . . . .  3
     2.1.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Node Behavior  . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  Validation of Discovered Pref64::/n  . . . . . . . . . . .  6
       3.1.1.  DNSSEC Requirements for the Network  . . . . . . . . .  6
       3.1.2.  DNSSEC Requirements for the Node . . . . . . . . . . .  7
     3.2.  Connectivity Check . . . . . . . . . . . . . . . . . . . .  8
       3.2.1.  No Connectivity Checks Against ipv4only.arpa . . . . .  9
     3.3.  Alternative Domain Names . . . . . . . . . . . . . . . . . 10
     3.4.  Message Flow Illustration  . . . . . . . . . . . . . . . . 10
   4.  Operational Considerations for Hosting the IPv4-Only
       Well-Known Name  . . . . . . . . . . . . . . . . . . . . . . . 12
   5.  Operational Considerations for DNS64 Operator  . . . . . . . . 12
     5.1.  Mapping of IPv4 Address Ranges to IPv6 Prefixes  . . . . . 12
   6.  Exit Strategy  . . . . . . . . . . . . . . . . . . . . . . . . 14
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 15
     10.2. Informative References . . . . . . . . . . . . . . . . . . 16
   Appendix A.  Example of DNS Record Configuration . . . . . . . . . 16
   Appendix B.  About the IPv4 Address for the Well-Known Name  . . . 17
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18

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1.  Introduction

   As part of the transition to IPv6, NAT64 [RFC6146] and DNS64
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