RFC - 2181
Clarifications to the DNS Specification
| Original: | ftp://ftp.isi.edu/in-notes/rfc2181.txt |
|---|---|
| Authors: | R. Elz [University of Melbourne], R. Bush [RGnet, Inc.] |
| Date: | July 1997 |
| Category: | Proposed Standard |
| Updates: | |
|---|---|
| RFC-1123std3 [STD 3] |
Requirements for Internet Hosts - Application and Support (Updated by RFC-1349, RFC-2181prop) |
| RFC-1035std13 [STD 13] |
Domain names - implementation and specification (Updated by RFC-1876exp, RFC-1348, RFC-4033prop, RFC-4035prop, RFC-4034prop, RFC-2308prop, RFC-2065, RFC-2845prop, RFC-2181prop, RFC-1995prop, RFC-1996prop, RFC-2535, RFC-4343prop, RFC-3658, RFC-1982prop, RFC-2136prop, RFC-3425prop, RFC-1101, RFC-1183exp, RFC-2137) |
| RFC-1034std13 [STD 13] |
Domain names - concepts and facilities (Updated by RFC-1876exp, RFC-1348, RFC-4033prop, RFC-4035prop, RFC-4034prop, RFC-2308prop, RFC-2065, RFC-2181prop, RFC-2535, RFC-4343prop, RFC-1982prop, RFC-4592prop, RFC-1101, RFC-1183exp) |
| Updated by: | |
|---|---|
| RFC-4343prop | Domain Name System (DNS) Case Insensitivity Clarification |
| RFC-4035prop | Protocol Modifications for the DNS Security Extensions (Updated by RFC-4470prop) |
| RFC-4034prop | Resource Records for the DNS Security Extensions (Updated by RFC-4470prop) |
| RFC-4033prop | DNS Security Introduction and Requirements |
| RFC-2535 | Domain Name System Security Extensions (Obsoleted by RFC-4033prop, RFC-4035prop, RFC-4034prop) (Updated by RFC-3755, RFC-3757, RFC-3226prop, RFC-3658, RFC-3655, RFC-3007prop, RFC-3008, RFC-3845, RFC-3597prop, RFC-3445, RFC-3090, RFC-2931prop) |
| Referred by: | 41 RFC |
| Refers to: | 7 RFC |
Status
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 considers some areas that have been identified as problems with the specification of the Domain Name System, and proposes remedies for the defects identified. Eight separate issues are considered:
- IP packet header address usage from multi-homed servers,
- TTLs in sets of records with the same name, class, and type,
- correct handling of zone cuts,
- three minor issues concerning SOA records and their use,
- the precise definition of the Time to Live (TTL)
- Use of the TC (truncated) header bit
- the issue of what is an authoritative, or canonical, name,
- and the issue of what makes a valid DNS label.
The first six of these are areas where the correct behaviour has been somewhat unclear, we seek to rectify that. The other two are already adequately specified, however the specifications seem to be sometimes ignored. We seek to reinforce the existing specifications.
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prepared by Miloslav Nic
- the founder of Zvon.org and Law-Ref.org
- the head of B.Sc. program Informatics and chemistry [in Czech]
- the founder of Lidem.org - Volby 2006 - parliamentary elections in the Czech Republic [in Czech]
- the chief consultant of the publishing house ICT Press
- and Pavel Srb, a student of B.Sc. program Informatics and chemistry