RFC 2874 (rfc2874) - Page 2 of 20
DNS Extensions to Support IPv6 Address Aggregation and Renumbering
Alternative Format: Original Text Document
RFC 2874 IPv6 DNS July 2000
Table of Contents
1. Introduction ............................................... 2
2. Overview ................................................... 3
2.1. Name-to-Address Lookup ............................... 4
2.2. Underlying Mechanisms for Reverse Lookups ............ 4
2.2.1. Delegation on Arbitrary Boundaries ............. 4
2.2.2. Reusable Zones ................................. 5
3. Specifications ............................................. 5
3.1. The A6 Record Type ................................... 5
3.1.1. Format ......................................... 6
3.1.2. Processing ..................................... 6
3.1.3. Textual Representation ......................... 7
3.1.4. Name Resolution Procedure ...................... 7
3.2. Zone Structure for Reverse Lookups ................... 7
4. Modifications to Existing Query Types ...................... 8
5. Usage Illustrations ........................................ 8
5.1. A6 Record Chains ..................................... 9
5.1.1. Authoritative Data ............................. 9
5.1.2. Glue ........................................... 10
5.1.3. Variations ..................................... 12
5.2. Reverse Mapping Zones ................................ 13
5.2.1. The TLA level .................................. 13
5.2.2. The ISP level .................................. 13
5.2.3. The Site Level ................................. 13
5.3. Lookups .............................................. 14
5.4. Operational Note ..................................... 15
6. Transition from RFC 1886 and Deployment Notes .............. 15
6.1. Transition from AAAA and Coexistence with A Records .. 16
6.2. Transition from Nibble Labels to Binary Labels ....... 17
7. Security Considerations .................................... 17
8. IANA Considerations ........................................ 17
9. Acknowledgments ............................................ 18
10. References ................................................ 18
11. Authors' Addresses ........................................ 19
12. Full Copyright Statement .................................. 20
1. Introduction
Maintenance of address information in the DNS is one of several
obstacles which have prevented site and provider renumbering from
being feasible in IP version 4. Arguments about the importance of
network renumbering for the preservation of a stable routing system
and for other purposes may be read in [RENUM1, RENUM2, RENUM3]. To
support the storage of IPv6 addresses without impeding renumbering we
define the following extensions.
Crawford, et al. Standards Track