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

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Network Working Group                                           T. Lemon
Internet-Draft                                       Nibbhaya Consulting
Intended status: Standards Track                             S. Cheshire
Expires: September 12, 2019                                   Apple Inc.
                                                          March 11, 2019

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

Abstract

   This document complements the specification of the Discovery Proxy
   for Multicast DNS-Based Service Discovery.  It describes a
   lightweight relay mechanism, a Discovery Relay, which, when present
   on a link, allows remote clients, not attached to that link, to
   perform mDNS discovery operations on that link.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

   Copyright (c) 2019 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
   (https://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

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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 . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Connections between Clients and Relays (overview) . . . .   6
     3.2.  mDNS Messages On Multicast Links  . . . . . . . . . . . .   7
   4.  Connections between Clients and Relays (details)  . . . . . .   8
   5.  Traffic from Relays to Clients  . . . . . . . . . . . . . . .  10
   6.  Traffic from Clients to Relays  . . . . . . . . . . . . . . .  12
   7.  Discovery Proxy Behavior  . . . . . . . . . . . . . . . . . .  13
   8.  DSO TLVs  . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  mDNS Link Data Request  . . . . . . . . . . . . . . . . .  14
     8.2.  mDNS Link Data Discontinue  . . . . . . . . . . . . . . .  14
     8.3.  Link Identifier . . . . . . . . . . . . . . . . . . . . .  15
     8.4.  Encapsulated mDNS Message . . . . . . . . . . . . . . . .  15
     8.5.  IP Source . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.6.  Link State Request  . . . . . . . . . . . . . . . . . . .  15
     8.7.  Link State Discontinue  . . . . . . . . . . . . . . . . .  16
     8.8.  Link Available  . . . . . . . . . . . . . . . . . . . . .  16
     8.9.  Link Unavailable  . . . . . . . . . . . . . . . . . . . .  16
     8.10. Link Prefix . . . . . . . . . . . . . . . . . . . . . . .  16
   9.  Provisioning  . . . . . . . . . . . . . . . . . . . . . . . .  18
     9.1.  Provisioned Objects . . . . . . . . . . . . . . . . . . .  19
       9.1.1.  Multicast Link  . . . . . . . . . . . . . . . . . . .  19
       9.1.2.  Discovery Proxy . . . . . . . . . . . . . . . . . . .  20
       9.1.3.  Discovery Relay . . . . . . . . . . . . . . . . . . .  21
     9.2.  Configuration Files . . . . . . . . . . . . . . . . . . .  22
     9.3.  Discovery Proxy Private Configuration . . . . . . . . . .  24
     9.4.  Discovery Relay Private Configuration . . . . . . . . . .  24
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  25
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  26
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  27
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  27
     13.2.  Informative References . . . . . . . . . . . . . . . . .  28
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  29

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