Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-01

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Document Type Active Internet-Draft (individual)
Authors Stuart Cheshire  , Ted Lemon 
Last updated 2017-10-30
Replaced by draft-ietf-dnssd-mdns-relay
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Network Working Group                                        S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                                T. Lemon
Expires: May 3, 2018                                 Barefoot Consulting
                                                        October 30, 2017

                     Multicast DNS Discovery Relay
                     draft-sctl-dnssd-mdns-relay-01

Abstract

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

Status of This Memo

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   This Internet-Draft will expire on May 3, 2018.

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

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Cheshire & Lemon           Expires May 3, 2018                  [Page 1]
Internet-Draft            mDNS Discovery Relay              October 2017

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Connections between Discovery and Discovery Relays  . . .   4
     3.2.  mDNS Messages On Links  . . . . . . . . . . . . . . . . .   5
   4.  Connections between Discovery Proxies and Discovery Relays  .   5
   5.  Traffic from Relays to Proxies  . . . . . . . . . . . . . . .   6
   6.  Traffic from Proxies to Relays  . . . . . . . . . . . . . . .   7
   7.  Discovery Proxy Behavior  . . . . . . . . . . . . . . . . . .   8
   8.  Session Signaling TLVs  . . . . . . . . . . . . . . . . . . .   8
     8.1.  MDNS Link Request . . . . . . . . . . . . . . . . . . . .   8
     8.2.  MDNS Link Invalid . . . . . . . . . . . . . . . . . . . .   9
     8.3.  MDNS Link Subscribed  . . . . . . . . . . . . . . . . . .   9
     8.4.  MDNS Message  . . . . . . . . . . . . . . . . . . . . . .   9
     8.5.  Layer 2 Source Address  . . . . . . . . . . . . . . . . .   9
     8.6.  IP Source Address . . . . . . . . . . . . . . . . . . . .  10
     8.7.  IP Source Port  . . . . . . . . . . . . . . . . . . . . .  10
     8.8.  Link Identifier . . . . . . . . . . . . . . . . . . . . .  10
     8.9.  MDNS Discontinue  . . . . . . . . . . . . . . . . . . . .  10
     8.10. IP Address Family . . . . . . . . . . . . . . . . . . . .  10
   9.  Provisioning  . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Provisioned Objects . . . . . . . . . . . . . . . . . . .  11
       9.1.1.  Discovery Proxy . . . . . . . . . . . . . . . . . . .  11
       9.1.2.  Link  . . . . . . . . . . . . . . . . . . . . . . . .  12
       9.1.3.  Discovery Relay . . . . . . . . . . . . . . . . . . .  13
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  13
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     13.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   The Discovery Proxy for Multicast DNS-Based Service Discovery
   [I-D.ietf-dnssd-hybrid] specification defines a mechanism for
   discovering services on a subnetted network using Multicast DNS
   (mDNS) [RFC6762], through the use of Discovery Proxies, which issue
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