Discovery of the IPv6 Prefix Used for IPv6 Address Synthesis
draft-ietf-behave-nat64-discovery-heuristic-17

Behave WG                                                  T. Savolainen
Internet-Draft                                                     Nokia
Intended status: Standards Track                             J. Korhonen
Expires: October 06, 2013                         Nokia Siemens Networks
                                                                 D. Wing
                                                           Cisco Systems
                                                          April 04, 2013

      Discovery of the IPv6 Prefix Used for IPv6 Address Synthesis
           draft-ietf-behave-nat64-discovery-heuristic-17.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 fully qualified 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.

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Savolainen, et al.      Expires October 06, 2013                [Page 1]
Internet-Draft            Pref64::/n Discovery                April 2013

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements and Terminology  . . . . . . . . . . . . . . . .   3
     2.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   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 Fully Qualified Domain Names  . . . . . . . .   9
     3.4.  Message Flow Illustration . . . . . . . . . . . . . . . .  10
   4.  Operational Considerations for Hosting the IPv4-Only Well-
       Known Name  . . . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  Operational Considerations for DNS64 Operator . . . . . . . .  12
     5.1.  Mapping of IPv4 Address Ranges to IPv6 Prefixes . . . . .  12
   6.  Exit Strategy . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Domain Name Reservation Considerations  . . . . . . . . .  14
     8.2.  IPv4 Address Allocation Considerations  . . . . . . . . .  15
     8.3.  IAB Statement Regarding This .arpa Request  . . . . . . .  16
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     10.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Appendix A.  Example of DNS Record Configuration  . . . . . . . .  18
   Appendix B.  About the IPv4 Address for the Well-Known Name . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

1.  Introduction