DNS-Based Service Discovery
RFC 6763
| Document | Type |
RFC - Proposed Standard
(February 2013; No errata)
Was draft-cheshire-dnsext-dns-sd (individual in int area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-cheshire-dnsext-nias | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6763 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ralph Droms | ||
| Send notices to | rfc@stuartcheshire.org | ||
Internet Engineering Task Force (IETF) S. Cheshire
Request for Comments: 6763 M. Krochmal
Category: Standards Track Apple Inc.
ISSN: 2070-1721 February 2013
DNS-Based Service Discovery
Abstract
This document specifies how DNS resource records are named and
structured to facilitate service discovery. Given a type of service
that a client is looking for, and a domain in which the client is
looking for that service, this mechanism allows clients to discover
a list of named instances of that desired service, using standard
DNS queries. This mechanism is referred to as DNS-based Service
Discovery, or DNS-SD.
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/rfc6763.
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.
Cheshire & Krochmal Standards Track [Page 1]
RFC 6763 DNS-Based Service Discovery February 2013
Table of Contents
1. Introduction ....................................................3
2. Conventions and Terminology Used in This Document ...............5
3. Design Goals ....................................................5
4. Service Instance Enumeration (Browsing) .........................6
4.1. Structured Service Instance Names ..........................6
4.2. User Interface Presentation ................................9
4.3. Internal Handling of Names .................................9
5. Service Instance Resolution ....................................10
6. Data Syntax for DNS-SD TXT Records .............................11
6.1. General Format Rules for DNS TXT Records ..................11
6.2. DNS-SD TXT Record Size ....................................12
6.3. DNS TXT Record Format Rules for Use in DNS-SD .............13
6.4. Rules for Keys in DNS-SD Key/Value Pairs ..................14
6.5. Rules for Values in DNS-SD Key/Value Pairs ................16
6.6. Example TXT Record ........................................17
6.7. Version Tag ...............................................17
6.8. Service Instances with Multiple TXT Records ...............18
7. Service Names ..................................................19
7.1. Selective Instance Enumeration (Subtypes) .................21
7.2. Service Name Length Limits ................................23
8. Flagship Naming ................................................25
9. Service Type Enumeration .......................................27
10. Populating the DNS with Information ...........................27
11. Discovery of Browsing and Registration Domains (Domain
Enumeration) ..................................................28
12. DNS Additional Record Generation ..............................30
12.1. PTR Records ..............................................30
12.2. SRV Records ..............................................30
12.3. TXT Records ..............................................31
12.4. Other Record Types .......................................31
13. Working Examples ..............................................31
13.1. What web pages are being advertised from dns-sd.org? .....31
13.2. What printer-configuration web pages are there? ..........31
13.3. How do I access the web page called "Service
Discovery"? ..............................................32
14. IPv6 Considerations ...........................................32
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