DNS64: DNS Extensions for Network Address Translation from IPv6 Clients to IPv4 Servers
RFC 6147
Document | Type | RFC - Proposed Standard (April 2011; Errata) | |
---|---|---|---|
Authors | Philip Matthews , Andrew Sullivan , Iljitsch van Beijnum , Marcelo Bagnulo | ||
Last updated | 2015-10-14 | ||
Replaces | draft-bagnulo-behave-dns64 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6147 (Proposed Standard) | |
Action Holders |
(None)
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||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | David Harrington | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) M. Bagnulo Request for Comments: 6147 UC3M Category: Standards Track A. Sullivan ISSN: 2070-1721 Shinkuro P. Matthews Alcatel-Lucent I. van Beijnum IMDEA Networks April 2011 DNS64: DNS Extensions for Network Address Translation from IPv6 Clients to IPv4 Servers Abstract DNS64 is a mechanism for synthesizing AAAA records from A records. DNS64 is used with an IPv6/IPv4 translator to enable client-server communication between an IPv6-only client and an IPv4-only server, without requiring any changes to either the IPv6 or the IPv4 node, for the class of applications that work through NATs. This document specifies DNS64, and provides suggestions on how it should be deployed in conjunction with IPv6/IPv4 translators. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc6147. Bagnulo, et al. Standards Track [Page 1] RFC 6147 DNS64 April 2011 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 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. Bagnulo, et al. Standards Track [Page 2] RFC 6147 DNS64 April 2011 Table of Contents 1. Introduction ....................................................4 2. Overview ........................................................5 3. Background to DNS64-DNSSEC Interaction ..........................7 4. Terminology .....................................................9 5. DNS64 Normative Specification ..................................10 5.1. Resolving AAAA Queries and the Answer Section .............11 5.1.1. The Answer when There is AAAA Data Available .......11 5.1.2. The Answer when There is an Error ..................11 5.1.3. Dealing with Timeouts ..............................12 5.1.4. Special Exclusion Set for AAAA Records .............12 5.1.5. Dealing with CNAME and DNAME .......................12 5.1.6. Data for the Answer when Performing Synthesis ......13 5.1.7. Performing the Synthesis ...........................13 5.1.8. Querying in Parallel ...............................14 5.2. Generation of the IPv6 Representations of IPv4 Addresses ..14 5.3. Handling Other Resource Records and the Additional Section ...................................................15 5.3.1. PTR Resource Record ................................15 5.3.2. Handling the Additional Section ....................16 5.3.3. Other Resource Records .............................17 5.4. Assembling a Synthesized Response to a AAAA Query .........17 5.5. DNSSEC Processing: DNS64 in Validating Resolver Mode ......17 6. Deployment Notes ...............................................19 6.1. DNS Resolvers and DNS64 ...................................19 6.2. DNSSEC Validators and DNS64 ...............................19 6.3. DNS64 and Multihomed and Dual-Stack Hosts .................19 6.3.1. IPv6 Multihomed Hosts ..............................19 6.3.2. Accidental Dual-Stack DNS64 Use ....................20 6.3.3. Intentional Dual-Stack DNS64 Use ...................21Show full document text