Multicast DNS Discovery Relay
draft-ietf-dnssd-mdns-relay-03
Network Working Group T. Lemon
Internet-Draft S. Cheshire
Intended status: Standards Track Apple Inc.
Expires: January 14, 2021 July 13, 2020
Multicast DNS Discovery Relay
draft-ietf-dnssd-mdns-relay-03
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.
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This Internet-Draft will expire on January 14, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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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 . . . . . . . . . . . . . . . . . . . 16
8.7. Link State Discontinue . . . . . . . . . . . . . . . . . 16
8.8. Link Available . . . . . . . . . . . . . . . . . . . . . 16
8.9. Link Unavailable . . . . . . . . . . . . . . . . . . . . 16
8.10. Link Prefix . . . . . . . . . . . . . . . . . . . . . . . 17
9. Provisioning . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Provisioned Objects . . . . . . . . . . . . . . . . . . . 19
9.1.1. Multicast Link . . . . . . . . . . . . . . . . . . . 20
9.1.2. Discovery Proxy . . . . . . . . . . . . . . . . . . . 21
9.1.3. Discovery Relay . . . . . . . . . . . . . . . . . . . 22
9.2. Configuration Files . . . . . . . . . . . . . . . . . . . 23
9.3. Discovery Proxy Private Configuration . . . . . . . . . . 25
9.4. Discovery Relay Private Configuration . . . . . . . . . . 25
10. Security Considerations . . . . . . . . . . . . . . . . . . . 26
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 27
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 28
13.1. Normative References . . . . . . . . . . . . . . . . . . 28
13.2. Informative References . . . . . . . . . . . . . . . . . 29
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 30
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