DNS Reverse IP AMT Discovery
draft-jholland-mboned-driad-amt-discovery-02

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Mboned                                                        J. Holland
Internet-Draft                                 Akamai Technologies, Inc.
Intended status: Standards Track                       November 13, 2018
Expires: May 17, 2019

                      DNS Reverse IP AMT Discovery
              draft-jholland-mboned-driad-amt-discovery-02

Abstract

   This document defines a new DNS resource record (RR) used to
   advertise addresses for Automatic Multicast Tunneling (AMT) relays
   capable of receiving multicast traffic from the owner of the RR.  The
   new AMTRELAY RR makes possible a source-specific method for AMT
   gateways to discover appropriate AMT relays, in order to ingest
   traffic for source-specific multicast channels into multicast-capable
   receiving networks when no multicast connectivity is directly
   available between the sending and receiving networks.

Status of This Memo

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   This Internet-Draft will expire on May 17, 2019.

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   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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Holland                   Expires May 17, 2019                  [Page 1]
Internet-Draft                    DRIAD                    November 2018

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Background and Terminology  . . . . . . . . . . . . . . .   3
     1.2.  Requirements Notation . . . . . . . . . . . . . . . . . .   4
   2.  Relay Discovery Operation . . . . . . . . . . . . . . . . . .   4
     2.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Example Receiving Networks  . . . . . . . . . . . . . . .   5
       2.2.1.  Tier 3 ISP  . . . . . . . . . . . . . . . . . . . . .   5
       2.2.2.  Small Office  . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Example Sending Networks  . . . . . . . . . . . . . . . .   9
       2.3.1.  Sender-controlled Relays  . . . . . . . . . . . . . .   9
       2.3.2.  Provider-controlled Relays  . . . . . . . . . . . . .  10
   3.  AMTRELAY Resource Record Definition . . . . . . . . . . . . .  10
     3.1.  AMTRELAY RRType . . . . . . . . . . . . . . . . . . . . .  10
     3.2.  AMTRELAY RData Format . . . . . . . . . . . . . . . . . .  11
       3.2.1.  RData Format - Precedence . . . . . . . . . . . . . .  11
       3.2.2.  RData Format - Discovery Optional (D-bit) . . . . . .  11
       3.2.3.  RData Format - Type . . . . . . . . . . . . . . . . .  12
       3.2.4.  RData Format - Relay  . . . . . . . . . . . . . . . .  12
     3.3.  AMTRELAY Record Presentation Format . . . . . . . . . . .  13
       3.3.1.  Representation of AMTRELAY RRs  . . . . . . . . . . .  13
       3.3.2.  Examples  . . . . . . . . . . . . . . . . . . . . . .  13
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
     5.1.  DNSSEC  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.2.  Local Override  . . . . . . . . . . . . . . . . . . . . .  14
     5.3.  Congestion  . . . . . . . . . . . . . . . . . . . . . . .  14
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Appendix A . . . . . . . . . . . . . . . . . . . . .  17
   Appendix B.  Appendix B . . . . . . . . . . . . . . . . . . . . .  18
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  19

1.  Introduction

   AMT (Automatic Multicast Tunneling) is defined in [RFC7450], and
   provides a method to transport multicast traffic in a unicast tunnel,
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