Multicast DNS
RFC 6762
Document | Type |
RFC - Proposed Standard
(February 2013; Errata)
Was draft-cheshire-dnsext-multicastdns (individual in int area)
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Authors | Stuart Cheshire , Marc Krochmal | ||
Last updated | 2018-12-20 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6762 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) S. Cheshire Request for Comments: 6762 M. Krochmal Category: Standards Track Apple Inc. ISSN: 2070-1721 February 2013 Multicast DNS Abstract As networked devices become smaller, more portable, and more ubiquitous, the ability to operate with less configured infrastructure is increasingly important. In particular, the ability to look up DNS resource record data types (including, but not limited to, host names) in the absence of a conventional managed DNS server is useful. Multicast DNS (mDNS) provides the ability to perform DNS-like operations on the local link in the absence of any conventional Unicast DNS server. In addition, Multicast DNS designates a portion of the DNS namespace to be free for local use, without the need to pay any annual fee, and without the need to set up delegations or otherwise configure a conventional DNS server to answer for those names. The primary benefits of Multicast DNS names are that (i) they require little or no administration or configuration to set them up, (ii) they work when no infrastructure is present, and (iii) they work during infrastructure failures. 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/rfc6762. Cheshire & Krochmal Standards Track [Page 1] RFC 6762 Multicast DNS February 2013 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. 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. Cheshire & Krochmal Standards Track [Page 2] RFC 6762 Multicast DNS February 2013 Table of Contents 1. Introduction ....................................................4 2. Conventions and Terminology Used in This Document ...............4 3. Multicast DNS Names .............................................5 4. Reverse Address Mapping .........................................7 5. Querying ........................................................8 6. Responding .....................................................13 7. Traffic Reduction ..............................................22 8. Probing and Announcing on Startup ..............................25 9. Conflict Resolution ............................................31 10. Resource Record TTL Values and Cache Coherency ................33 11. Source Address Check ..........................................38 12. Special Characteristics of Multicast DNS Domains ..............40 13. Enabling and Disabling Multicast DNS ..........................41 14. Considerations for Multiple Interfaces ........................42 15. Considerations for Multiple Responders on the Same Machine ....43 16. Multicast DNS Character Set ...................................45 17. Multicast DNS Message Size ....................................46 18. Multicast DNS Message Format ..................................47Show full document text