DNAME Redirection in the DNS
RFC 6672
| Document | Type |
RFC - Proposed Standard
(June 2012; No errata)
Obsoletes RFC 2672
Updates RFC 3363
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | Andrew Sullivan | ||
| IESG | IESG state | RFC 6672 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ralph Droms | ||
| IESG note | Andrew Sullivan (ajs@shinkuro.com) is the Document Shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) S. Rose
Request for Comments: 6672 NIST
Obsoletes: 2672 W. Wijngaards
Updates: 3363 NLnet Labs
Category: Standards Track June 2012
ISSN: 2070-1721
DNAME Redirection in the DNS
Abstract
The DNAME record provides redirection for a subtree of the domain
name tree in the DNS. That is, all names that end with a particular
suffix are redirected to another part of the DNS. This document
obsoletes the original specification in RFC 2672 as well as updates
the document on representing IPv6 addresses in DNS (RFC 3363).
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/rfc6672.
Rose & Wijngaards Standards Track [Page 1]
RFC 6672 DNAME Redirection June 2012
Copyright Notice
Copyright (c) 2012 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
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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.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Rose & Wijngaards Standards Track [Page 2]
RFC 6672 DNAME Redirection June 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. The DNAME Resource Record . . . . . . . . . . . . . . . . . . 5
2.1. Format . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. The DNAME Substitution . . . . . . . . . . . . . . . . . . 5
2.3. DNAME Owner Name Matching the QNAME . . . . . . . . . . . 6
2.4. Names next to and below a DNAME Record . . . . . . . . . . 7
2.5. Compression of the DNAME Record . . . . . . . . . . . . . 7
3. Processing . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1. CNAME Synthesis . . . . . . . . . . . . . . . . . . . . . 8
3.2. Server Algorithm . . . . . . . . . . . . . . . . . . . . . 9
3.3. Wildcards . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4. Acceptance and Intermediate Storage . . . . . . . . . . . 11
3.4.1. Resolver Algorithm . . . . . . . . . . . . . . . . . . 11
4. DNAME Discussions in Other Documents . . . . . . . . . . . . . 12
5. Other Issues with DNAME . . . . . . . . . . . . . . . . . . . 13
5.1. Canonical Hostnames Cannot Be below DNAME Owners . . . . . 13
5.2. Dynamic Update and DNAME . . . . . . . . . . . . . . . . . 13
5.3. DNSSEC and DNAME . . . . . . . . . . . . . . . . . . . . . 14
5.3.1. Signed DNAME, Unsigned Synthesized CNAME . . . . . . . 14
5.3.2. DNAME Bit in NSEC Type Map . . . . . . . . . . . . . . 14
5.3.3. DNAME Chains as Strong as the Weakest Link . . . . . . 14
5.3.4. Validators Must Understand DNAME . . . . . . . . . . . 14
5.3.4.1. Invalid Name Error Response Caused by DNAME in
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