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DNS Extensions to support IP version 6 (RFC1886)

IP.com Disclosure Number: IPCOM000004142D
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2019-Feb-12
Document File: 5 page(s) / 5K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Thomson: AUTHOR [+1]

Related Documents

10.17487/RFC1886: DOI

Abstract

This document defines the changes that need to be made to the Domain Name System to support hosts running IP version 6 (IPv6). [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 56% of the total text.

Network Working Group S. Thomson Request for Comments: 1886 Bellcore Category: Standards Track C. Huitema INRIA December 1995

DNS Extensions to support IP version 6

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Abstract

This document defines the changes that need to be made to the Domain Name System to support hosts running IP version 6 (IPv6). The changes include a new resource record type to store an IPv6 address, a new domain to support lookups based on an IPv6 address, and updated definitions of existing query types that return Internet addresses as part of additional section processing. The extensions are designed to be compatible with existing applications and, in particular, DNS implementations themselves.

Thompson & Huitema Standards Track [Page 1]

RFC 1886 IPv6 DNS Extensions December 1995

1. INTRODUCTION

Current support for the storage of Internet addresses in the Domain Name System (DNS)[1,2] cannot easily be extended to support IPv6 addresses[3] since applications assume that address queries return 32-bit IPv4 addresses only.

To support the storage of IPv6 addresses we define the following extensions:

o A new resource record type is defined to map a domain name to an IPv6 address.

o A new domain is defined to support lookups based on address.

o Existing queries that perform additional section processing to locate IPv4 addresses are redefined to perform additional section processing on both IPv4 and IPv6 addresses.

The changes are designed to be compatible with existing software. The existing support for IPv4 addresses is retained. Transition issues related to the co-existence of both IPv4 and IPv6 addresses in DNS are discussed in [4].

2. NEW RESOURCE RECORD DEFINITION AND DOMAIN

A new record type is defined to store a host’s IPv6 address. A host that has more than one IPv6 address must have more than one such record.

2.1 AAAA record type

The AAAA resource record type is a new record specific to the Internet class that stores a single IPv6 address.

The value of the type is 28 (decimal).

2.2 AAAA data format

A 128 bit IPv6 address is encoded in the data portion of an AAAA resource record in network byte order (high-order byte first).

Thompson & Huitema Standards Track [Page 2]

RFC 1886 IPv6 DNS Extensions December 1995

2.3 AAAA query

An AAAA query for a specified domain name in the Internet class returns all associated AAAA resource records in the answer section of a response.

A type AAAA query does not perform additional section processing.

2.4 Textual format of AAAA records

The textual representation of the data portion of the AAAA resource record used in a master database file is the textual representation of a IPv6 address...

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