Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-04

Document Type Active Internet-Draft (dnssd WG)
Last updated 2018-04-04 (latest revision 2018-03-21)
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Network Working Group                                        S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                                T. Lemon
Expires: September 19, 2018                          Nibbhaya Consulting
                                                          March 18, 2018

                     Multicast DNS Discovery Relay
                     draft-sctl-dnssd-mdns-relay-04

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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 19, 2018.

Copyright Notice

   Copyright (c) 2018 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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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 Link Discontinue . . . . . . . . . . . . . . . . . .  10
     8.3.  Link Identifier . . . . . . . . . . . . . . . . . . . . .  10
     8.4.  mDNS Message  . . . . . . . . . . . . . . . . . . . . . .  11
     8.5.  Layer Two Source Address  . . . . . . . . . . . . . . . .  11
     8.6.  IP Source . . . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Provisioning  . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Provisioned Objects . . . . . . . . . . . . . . . . . . .  12
       9.1.1.  Multicast Link  . . . . . . . . . . . . . . . . . . .  13
       9.1.2.  Discovery Proxy . . . . . . . . . . . . . . . . . . .  14
       9.1.3.  Discovery Relay . . . . . . . . . . . . . . . . . . .  15
     9.2.  Configuration Files . . . . . . . . . . . . . . . . . . .  15
     9.3.  Discovery Proxy Configuration . . . . . . . . . . . . . .  17
     9.4.  Discovery Relay Configuration . . . . . . . . . . . . . .  17
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  18
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  18
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  19
     13.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

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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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