Analysis of solution proposals for hosts to learn NAT64 prefix
draft-ietf-behave-nat64-learn-analysis-02

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Document Type Active Internet-Draft (behave WG)
Last updated 2012-02-05 (latest revision 2011-12-09)
Replaces draft-korhonen-behave-nat64-learn-analysis
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Send notices to behave-chairs@tools.ietf.org, draft-ietf-behave-nat64-learn-analysis@tools.ietf.org
Behavior Engineering for Hindrance                      J. Korhonen, Ed.
Avoidance (BEHAVE)                                Nokia Siemens Networks
Internet-Draft                                        T. Savolainen, Ed.
Intended status: Informational                                     Nokia
Expires: June 11, 2012                                  December 9, 2011

     Analysis of solution proposals for hosts to learn NAT64 prefix
             draft-ietf-behave-nat64-learn-analysis-02.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

   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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on June 11, 2012.

Copyright Notice

   Copyright (c) 2011 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

Korhonen & Savolainen     Expires June 11, 2012                 [Page 1]
Internet-Draft            Learning NAT64 prefix            December 2011

   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 . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology and Assumptions  . . . . . . . . . . . . . . . . .  4
   3.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   4.  Proposed solutions to learn about synthesis and
       Network-Specific Prefix  . . . . . . . . . . . . . . . . . . .  7
     4.1.  DNS Query for a Well-Known Name  . . . . . . . . . . . . .  7
       4.1.1.  Solution description . . . . . . . . . . . . . . . . .  7
       4.1.2.  Analysis and discussion  . . . . . . . . . . . . . . .  8
       4.1.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . .  9
     4.2.  EDNS0 option indicating AAAA Record synthesis and
           format . . . . . . . . . . . . . . . . . . . . . . . . . .  9
       4.2.1.  Solution description . . . . . . . . . . . . . . . . .  9
       4.2.2.  Analysis and discussion  . . . . . . . . . . . . . . .  9
       4.2.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 10
     4.3.  EDNS0 flags indicating AAAA Record synthesis and format  . 10
       4.3.1.  Solution description . . . . . . . . . . . . . . . . . 10
       4.3.2.  Analysis and discussion  . . . . . . . . . . . . . . . 11
       4.3.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 11
     4.4.  DNS Resource Record for IPv4-Embedded IPv6 address . . . . 12
       4.4.1.  Solution description . . . . . . . . . . . . . . . . . 12
       4.4.2.  Analysis and discussion  . . . . . . . . . . . . . . . 12
       4.4.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 13
     4.5.  Learning the IPv6 Prefix of a Network's NAT64 using DNS  . 13
       4.5.1.  Solution description . . . . . . . . . . . . . . . . . 13
       4.5.2.  Analysis and discussion  . . . . . . . . . . . . . . . 13
       4.5.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 14
     4.6.  Learning the IPv6 Prefix of a Network's NAT64 using
           DHCPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . 15
       4.6.1.  Solution description . . . . . . . . . . . . . . . . . 15
       4.6.2.  Analysis and discussion  . . . . . . . . . . . . . . . 15
       4.6.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 16
     4.7.  Learning the IPv6 Prefix of a Network's NAT64 using
           Router Advertisements  . . . . . . . . . . . . . . . . . . 16
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