Analysis of solution proposals for hosts to learn NAT64 prefix
draft-ietf-behave-nat64-learn-analysis-03

Behavior Engineering for Hindrance                      J. Korhonen, Ed.
Avoidance (BEHAVE)                                Nokia Siemens Networks
Internet-Draft                                        T. Savolainen, Ed.
Intended status: Informational                                     Nokia
Expires: September 8, 2012                                 March 7, 2012

     Analysis of solution proposals for hosts to learn NAT64 prefix
             draft-ietf-behave-nat64-learn-analysis-03.txt

Abstract

   Hosts and applications may benefit from the knowledge if an IPv6
   address is synthesized, which would mean a NAT64 is used to reach the
   IPv4 network or Internet.  This document analyses a number of
   proposed solutions for communicating whether the synthesis is taking
   place, used address format, and the IPv6 prefix used by the NAT64 and
   DNS64.  The solutions enable both NAT64 avoidance and intentional
   utilization by allowing local IPv6 address synthesis.  The document
   concludes by recommending selection of heuristic discovery based
   solution.

Status of this Memo

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   This Internet-Draft will expire on September 8, 2012.

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   publication of this document.  Please review these documents

Korhonen & Savolainen   Expires September 8, 2012               [Page 1]
Internet-Draft            Learning NAT64 prefix               March 2012

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   5.  Proposed solutions to learn about synthesis and
       Network-Specific Prefix  . . . . . . . . . . . . . . . . . . .  8
     5.1.  DNS Query for a Well-Known Name  . . . . . . . . . . . . .  8
       5.1.1.  Solution description . . . . . . . . . . . . . . . . .  8
       5.1.2.  Analysis and discussion  . . . . . . . . . . . . . . .  8
       5.1.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . .  9
     5.2.  EDNS0 option indicating AAAA Record synthesis and
           format . . . . . . . . . . . . . . . . . . . . . . . . . .  9
       5.2.1.  Solution description . . . . . . . . . . . . . . . . .  9
       5.2.2.  Analysis and discussion  . . . . . . . . . . . . . . .  9
       5.2.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 10
     5.3.  EDNS0 flags indicating AAAA Record synthesis and format  . 11
       5.3.1.  Solution description . . . . . . . . . . . . . . . . . 11
       5.3.2.  Analysis and discussion  . . . . . . . . . . . . . . . 11
       5.3.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 12
     5.4.  DNS Resource Record for IPv4-Embedded IPv6 address . . . . 12
       5.4.1.  Solution description . . . . . . . . . . . . . . . . . 12
       5.4.2.  Analysis and discussion  . . . . . . . . . . . . . . . 12
       5.4.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 13
     5.5.  Learning the IPv6 Prefix of a Network's NAT64 using DNS  . 13
       5.5.1.  Solution description . . . . . . . . . . . . . . . . . 13
       5.5.2.  Analysis and discussion  . . . . . . . . . . . . . . . 14
       5.5.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 15
     5.6.  Learning the IPv6 Prefix of a Network's NAT64 using
           DHCPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . 15
       5.6.1.  Solution description . . . . . . . . . . . . . . . . . 15
       5.6.2.  Analysis and discussion  . . . . . . . . . . . . . . . 16