Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-02

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Last updated 2017-11-12
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Network Working Group                                        S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                                T. Lemon
Expires: May 16, 2018                                Barefoot Consulting
                                                       November 12, 2017

                     Multicast DNS Discovery Relay
                     draft-sctl-dnssd-mdns-relay-02

Abstract

   This document extends the specification of the Discovery Proxy for
   Multicast DNS-Based Service Discovery.  It describes a lightweight
   relay mechanism, a Discovery Relay, which allows Discovery Proxies to
   provide service on multicast links to which they are not directly
   attached.

Status of This Memo

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   This Internet-Draft will expire on May 16, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Connections between Proxies and Relays (overview) . . . .   5
     3.2.  mDNS Messages On Multicast Links  . . . . . . . . . . . .   6
   4.  Connections between Proxies and Relays (details)  . . . . . .   6
   5.  Traffic from Relays to Proxies  . . . . . . . . . . . . . . .   7
   6.  Traffic from Proxies to Relays  . . . . . . . . . . . . . . .   8
   7.  Discovery Proxy Behavior  . . . . . . . . . . . . . . . . . .   9
   8.  DSO TLVs  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.1.  mDNS Link Request . . . . . . . . . . . . . . . . . . . .  10
     8.2.  mDNS Discontinue  . . . . . . . . . . . . . . . . . . . .  10
     8.3.  mDNS Message  . . . . . . . . . . . . . . . . . . . . . .  10
     8.4.  Link Identifier . . . . . . . . . . . . . . . . . . . . .  10
     8.5.  Layer Two Source Address  . . . . . . . . . . . . . . . .  11
     8.6.  IP Source . . . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Provisioning  . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Provisioned Objects . . . . . . . . . . . . . . . . . . .  12
       9.1.1.  Discovery Proxy . . . . . . . . . . . . . . . . . . .  12
       9.1.2.  Multicast Link  . . . . . . . . . . . . . . . . . . .  13
       9.1.3.  Discovery Relay . . . . . . . . . . . . . . . . . . .  13
     9.2.  Configuration Files . . . . . . . . . . . . . . . . . . .  14
     9.3.  Discovery Proxy Configuration . . . . . . . . . . . . . .  15
     9.4.  Discovery Relay Configuration . . . . . . . . . . . . . .  15
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  16
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     13.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

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1.  Introduction

   The Discovery Proxy for Multicast DNS-Based Service Discovery
   [I-D.ietf-dnssd-hybrid] is a mechanism for discovering services on a
   subnetted network through the use of Discovery Proxies, which issue
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