DNS46 for the IPv4/IPv6 Stateless Translator
draft-xli-behave-dns46-for-stateless-06

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Last updated 2017-01-28
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Network Working Group                                             C. Bao
Internet-Draft                                                     X. Li
Intended status: Informational                    CERNET Center/Tsinghua
Expires: August 1, 2017                                       University
                                                        January 28, 2017

              DNS46 for the IPv4/IPv6 Stateless Translator
                draft-xli-behave-dns46-for-stateless-06

Abstract

   The stateless translator can support IPv6-initiated communications as
   well as IPv4-initiated communications for IPv6 hosts using IPv4-
   translatable addresses.  DNS support for the IPv6-initiated
   communication is defined in the DNS64 specification.  This document
   defines the DNS46 function for the stateless translator.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 1, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . . . 3
   3.  DNS46 for the IPv4/IPv6 Stateless Translator  . . . . . . . . . 3
     3.1.  Authoritative DNS server  . . . . . . . . . . . . . . . . . 3
       3.1.1.  Static AAAA record  . . . . . . . . . . . . . . . . . . 3
       3.1.2.  Varying AAAA record . . . . . . . . . . . . . . . . . . 4
     3.2.  DNS resolver  . . . . . . . . . . . . . . . . . . . . . . . 4
       3.2.1.  DNS resolver for scenario 6 . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6

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1.  Introduction

   DNS mechanism is one of the functions model for the IPv4/IPv6
   transition [RFC6144].  DNS64 allows IPv6 hosts to resolve names of
   IPv4 hosts whereas DNS46 allows IPv4 hosts to resolve names of IPv6
   hosts.

   General DNS46 is considered harmful, as NAT-PT was deprecated by IETF
   [RFC4966].  However, stateless translators can support IPv6-initiated
   communications (scenario 1 and 3) which requires the DNS64 support
   [RFC6146] [RFC6145], as well as IPv4-initiated communications
   (scenario 2 and 4) which requires the DNS46 support [RFC6145].

   DNS64 is used for both stateful and stateless translators and it is
   defined in [RFC6147].  DNS46 is only used for the stateless
   translators and it is defines in this document.

2.  Notational Conventions

   The key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
   SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
   document, are to be interpreted as described in [RFC2119].

3.  DNS46 for the IPv4/IPv6 Stateless Translator

   The DNS46 for stateless IPv4/IPv6 translation is for the following
   scenarios:

   o  Scenario 2: The IPv4 Internet to an IPv6 network.
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