DNS Reverse IP AMT Discovery
draft-ietf-mboned-driad-amt-discovery-06
Mboned J. Holland
Internet-Draft Akamai Technologies, Inc.
Updates: 7450 (if approved) May 06, 2019
Intended status: Standards Track
Expires: November 7, 2019
DNS Reverse IP AMT Discovery
draft-ietf-mboned-driad-amt-discovery-06
Abstract
This document updates RFC 7450 (Automatic Multicast Tunneling, or
AMT) by extending the relay discovery process to use a new DNS
resource record named AMTRELAY when discovering AMT relays for
source-specific multicast channels. The reverse IP DNS zone for a
multicast sender's IP address is configured to use AMTRELAY resource
records to advertise a set of AMT relays that can receive and forward
multicast traffic from that sender over an AMT tunnel.
Status of This Memo
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This Internet-Draft will expire on November 7, 2019.
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Holland Expires November 7, 2019 [Page 1]
Internet-Draft DRIAD May 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Background . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1. Relays and Gateways . . . . . . . . . . . . . . . . . 4
1.2.2. Definitions . . . . . . . . . . . . . . . . . . . . . 4
2. Relay Discovery Operation . . . . . . . . . . . . . . . . . . 5
2.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2. Signaling and Discovery . . . . . . . . . . . . . . . . . 6
2.3. Happy Eyeballs . . . . . . . . . . . . . . . . . . . . . 8
2.3.1. Overview . . . . . . . . . . . . . . . . . . . . . . 8
2.3.2. Connection Definition . . . . . . . . . . . . . . . . 9
2.4. Optimal Relay Selection . . . . . . . . . . . . . . . . . 9
2.4.1. Overview . . . . . . . . . . . . . . . . . . . . . . 9
2.4.2. Preference Ordering . . . . . . . . . . . . . . . . . 10
2.4.3. Connecting to Multiple Relays . . . . . . . . . . . . 13
2.5. Guidelines for Restarting Discovery . . . . . . . . . . . 13
2.5.1. Overview . . . . . . . . . . . . . . . . . . . . . . 13
2.5.2. Updates to Restarting Events . . . . . . . . . . . . 14
2.5.3. Tunnel Stability . . . . . . . . . . . . . . . . . . 15
2.5.4. Traffic Health . . . . . . . . . . . . . . . . . . . 15
2.5.5. Relay Loaded or Shutting Down . . . . . . . . . . . . 17
2.5.6. Relay Discovery Messages vs. Restarting Discovery . . 17
2.5.7. Independent Discovery Per Traffic Source . . . . . . 18
2.6. DNS Configuration . . . . . . . . . . . . . . . . . . . . 18
2.7. Waiting for DNS resolution . . . . . . . . . . . . . . . 19
3. Example Deployments . . . . . . . . . . . . . . . . . . . . . 19
3.1. Example Receiving Networks . . . . . . . . . . . . . . . 19
3.1.1. Tier 3 ISP . . . . . . . . . . . . . . . . . . . . . 19
3.1.2. Small Office . . . . . . . . . . . . . . . . . . . . 20
3.2. Example Sending Networks . . . . . . . . . . . . . . . . 22
3.2.1. Sender-controlled Relays . . . . . . . . . . . . . . 22
3.2.2. Provider-controlled Relays . . . . . . . . . . . . . 23
4. AMTRELAY Resource Record Definition . . . . . . . . . . . . . 24
4.1. AMTRELAY RRType . . . . . . . . . . . . . . . . . . . . . 24
4.2. AMTRELAY RData Format . . . . . . . . . . . . . . . . . . 24
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