Multicast DNS Discovery Relay
draft-sctl-dnssd-mdns-relay-04
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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.
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 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
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
Cheshire & Lemon Expires September 19, 2018 [Page 1]
Internet-Draft mDNS Discovery Relay March 2018
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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