Discovery of IPv6 Prefix Used for IPv6 Address Synthesis
draft-ietf-behave-nat64-discovery-heuristic-07

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Document Type Active Internet-Draft (behave WG)
Last updated 2012-03-13
Replaces draft-savolainen-heuristic-nat64-discovery
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Behave WG                                                  T. Savolainen
Internet-Draft                                                     Nokia
Intended status: Standards Track                             J. Korhonen
Expires: September 13, 2012                       Nokia Siemens Networks
                                                                 D. Wing
                                                           Cisco Systems
                                                          March 12, 2012

        Discovery of IPv6 Prefix Used for IPv6 Address Synthesis
           draft-ietf-behave-nat64-discovery-heuristic-07.txt

Abstract

   This document describes a method for detecting presence of DNS64 and
   for learning IPv6 prefix used for protocol translation on an access
   network.  The method depends on 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
   traversal through NAT64 on dual-stack accesses 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 September 13, 2012.

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

Savolainen, et al.     Expires September 13, 2012               [Page 1]
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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.  Secure Learning of Pref64::/n  . . . . . . . . . . . . . .  6
       3.1.1.  DNSSEC Requirements for the Network  . . . . . . . . .  6
       3.1.2.  Node Behavior  . . . . . . . . . . . . . . . . . . . .  6
     3.2.  Connectivity Check . . . . . . . . . . . . . . . . . . . .  7
       3.2.1.  No Connectivity Checks Against ipv4only.arpa . . . . .  8
     3.3.  Alternative Domain Names . . . . . . . . . . . . . . . . .  9
   4.  Operational Considerations for Hosting the IPv4-Only
       Well-Known Name  . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  DNS(64) Entity Considerations  . . . . . . . . . . . . . . . .  9
   6.  Exit Strategy  . . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
     8.1.  About the IPv4 Address for the Well-Known Name . . . . . . 10
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 11
     10.2. Informative References . . . . . . . . . . . . . . . . . . 12
   Appendix A.  Example of DNS Record Configuration . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   As part of the transition to IPv6, NAT64 [RFC6146] and DNS64
   [RFC6147] technologies will be utilized by some access networks to
   provide IPv4 connectivity for IPv6-only nodes [RFC6144].  The DNS64
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