Requirements for Scalable DNS-Based Service Discovery (DNS-SD) / Multicast DNS (mDNS) Extensions
RFC 7558

Document Type RFC - Informational (July 2015; No errata)
Last updated 2015-10-14
Replaces draft-lynn-dnssd-requirements
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Tim Chown
Shepherd write-up Show (last changed 2014-11-13)
IESG IESG state RFC 7558 (Informational)
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IANA IANA review state IANA OK - No Actions Needed
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Internet Engineering Task Force (IETF)                           K. Lynn
Request for Comments: 7558                                  Verizon Labs
Category: Informational                                      S. Cheshire
ISSN: 2070-1721                                              Apple, Inc.
                                                             M. Blanchet
                                                                Viagenie
                                                              D. Migault
                                                                Ericsson
                                                               July 2015

              Requirements for Scalable DNS-Based Service
          Discovery (DNS-SD) / Multicast DNS (mDNS) Extensions

Abstract

   DNS-based Service Discovery (DNS-SD) over Multicast DNS (mDNS) is
   widely used today for discovery and resolution of services and names
   on a local link, but there are use cases to extend DNS-SD/mDNS to
   enable service discovery beyond the local link.  This document
   provides a problem statement and a list of requirements for scalable
   DNS-SD.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc7558.

Lynn, et al.                  Informational                     [Page 1]
RFC 7558              Scalable DNS-SD Requirements             July 2015

Copyright Notice

   Copyright (c) 2015 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Basic Use Cases . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Namespace Considerations  . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Acknowedgements . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   DNS-based Service Discovery [DNS-SD] in combination with its
   companion technology Multicast DNS [mDNS] is widely used today for
   discovery and resolution of services and names on a local link.  As
   users move to multi-link home or campus networks, however, they find
   that mDNS (by design) does not work across routers.  DNS-SD can also
   be used in conjunction with conventional unicast DNS to enable
   wide-area service discovery, but this capability is not yet widely
   deployed.  This disconnect between customer needs and current
   practice has led to calls for improvement, such as the Educause
   petition [EP].

   In response to this and similar evidence of market demand, several
   products now enable service discovery beyond the local link using
   different ad hoc techniques.  As of yet, no consensus has emerged
   regarding which approach represents the best long-term direction for
   DNS-based Service Discovery protocol development.

Lynn, et al.                  Informational                     [Page 2]
RFC 7558              Scalable DNS-SD Requirements             July 2015

   Multicast DNS in its present form is also not optimized for network
   technologies where multicast transmissions are relatively expensive.
   Wireless networks such as Wi-Fi [IEEE.802.11] may be adversely
   affected by excessive mDNS traffic due to the higher network overhead
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