Domain Name System (DNS) IANA Considerations
RFC 6895
| Document | Type |
RFC - Best Current Practice
(April 2013; No errata)
Obsoletes RFC 6195
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-eastlake-dnsext-6195bis | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6895 (Best Current Practice) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ralph Droms | ||
| IESG note | Olafur Gudmundsson (ogud@ogud.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) D. Eastlake 3rd
Request for Comments: 6895 Huawei
BCP: 42 April 2013
Obsoletes: 6195
Updates: 1183, 2845, 2930, 3597
Category: Best Current Practice
ISSN: 2070-1721
Domain Name System (DNS) IANA Considerations
Abstract
This document specifies Internet Assigned Numbers Authority (IANA)
parameter assignment considerations for the allocation of Domain Name
System (DNS) resource record types, CLASSes, operation codes, error
codes, DNS protocol message header bits, and AFSDB resource record
subtypes. It obsoletes RFC 6195 and updates RFCs 1183, 2845, 2930,
and 3597.
Status of This Memo
This memo documents an Internet Best Current Practice.
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
BCPs 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/rfc6895.
Copyright Notice
Copyright (c) 2013 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.
Eastlake Best Current Practice [Page 1]
RFC 6895 DNS IANA Considerations April 2013
Table of Contents
1. Introduction ....................................................2
1.1. Terminology ................................................3
2. DNS Query/Response Headers ......................................3
2.1. One Spare Bit? .............................................4
2.2. OpCode Assignment ..........................................4
2.3. RCODE Assignment ...........................................4
3. DNS Resource Records ............................................6
3.1. RRTYPE IANA Considerations .................................7
3.1.1. DNS RRTYPE Allocation Policy ........................8
3.1.2. DNS RRTYPE Expert Guidelines .......................10
3.1.3. Special Note on the OPT RR .........................10
3.1.4. The AFSDB RR Subtype Field .........................10
3.2. RR CLASS IANA Considerations ..............................11
3.3. Label Considerations ......................................13
3.3.1. Label Types ........................................13
3.3.2. Label Contents and Use .............................13
4. Security Considerations ........................................14
5. IANA Considerations ............................................14
Appendix A. RRTYPE Allocation Template ............................15
Appendix B. Changes from RFC 6195 .................................16
Normative References ..............................................17
Informative References ............................................18
Acknowledgements ..................................................19
1. Introduction
The Domain Name System (DNS) provides replicated distributed secure
hierarchical databases that store "resource records" (RRs) under
domain names. DNS data is structured into CLASSes and zones that can
be independently maintained. Familiarity with [RFC1034], [RFC1035],
[RFC2136], [RFC2181], and [RFC4033] is assumed.
This document provides, either directly or by reference, the general
IANA parameter assignment considerations that apply across DNS query
and response headers and all RRs. There may be additional IANA
considerations that apply to only a particular RRTYPE or
query/response OpCode. See the specific RFC defining that RRTYPE or
query/response OpCode for such considerations if they have been
defined, except for AFSDB RR considerations [RFC1183], which are
included herein. This RFC obsoletes [RFC6195]; however, the only
significant changes are those to the RRTYPE IANA allocation process,
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