Service Discovery Road Map
draft-cheshire-dnssd-roadmap-01

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Internet Engineering Task Force                              S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Informational                            March 18, 2018
Expires: September 19, 2018

                       Service Discovery Road Map
                    draft-cheshire-dnssd-roadmap-01

Abstract

   Over the course of several years, a rich collection of technologies
   has developed around DNS-Based Service Discovery, described across
   multiple documents.  This "Road Map" document gives an overview of
   how these related but separate technologies (and their documents) fit
   together, to facilitate service discovery in various environments.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 19, 2018.

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1.  Road Map

   DNS-Based Service Discovery [RFC6763] is a component of Zero
   Configuration Networking [RFC6760] [ZC].

   Over the course of several years, a rich collection of technologies
   has developed around DNS-Based Service Discovery.  These various
   related but separate technologies are described across multiple
   documents.  This "Road Map" document gives an overview of how these
   technologies (and their documents) fit together to facilitate service
   discovery across a broad range of operating environments, from small
   scale zero-configuration networks to large scale administered
   networks, from local area to wide area, and from low-speed wireless
   links in the kb/s range to high-speed wired links operating at
   multiple Gb/s.

   Not all of the available components are necessary or appropriate in
   all scenarios.  One goal of this "Road Map" document is to provide
   guidance about which components to use depending on the problem being
   solved.

2.  Namespace of Service Types

   The single most important concept in service discovery is the
   namespace specifying how different service types are identified.
   This is how a client communicates what it needs, and how a server
   communicates what it offers.  For a client to discover a server, the
   client and server need to have a common language to describe what
   they need and what they offer.  The need to use the same namespace of
   service types, otherwise they may actually speak the same application
   protocol over the air or on the wire, and may in fact be completely
   compatible, and yet may be unable to detect this because they are
   using different names to refer to the same actual service.  Hence,
   having a consistent namespace of service types is the essential
   prerequisite for any useful service discovery.

   IANA manages the registry of Service Types [RFC6335][STR].  This
   registry of Service Types can (and should) be used in any service
   discovery protocol as the vocabulary for describing *all* IP-based
   services, not only DNS-Based Service Discovery [RFC6763].

   In this document we focus on the use of the IANA Service Type
   Registry [STR] in conjunction with DNS-Based Service Discovery,
   though that should not be taken in any way to imply any criticism of
   other service discovery protocols sharing the same namespace of
   service types.  In different circumstances different Service
   Discovery protocols are appropriate.

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   For example, for service discovery of services potentially available