Traversal Using Relays around NAT (TURN) Server Auto Discovery
RFC 8155

Document Type RFC - Proposed Standard (April 2017; No errata)
Updates RFC 5766
Last updated 2017-04-19
Replaces draft-patil-tram-turn-serv-disc
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Nov 2015 - Send new TURN server... )
Document shepherd Simon Perreault
Shepherd write-up Show (last changed 2016-07-13)
IESG IESG state RFC 8155 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Spencer Dawkins
Send notices to "Simon Perreault" <sperreault@jive.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          P. Patil
Request for Comments: 8155                                      T. Reddy
Updates: 5766                                                      Cisco
Category: Standards Track                                        D. Wing
ISSN: 2070-1721                                               April 2017

     Traversal Using Relays around NAT (TURN) Server Auto Discovery

Abstract

   Current Traversal Using Relays around NAT (TURN) server discovery
   mechanisms are relatively static and limited to explicit
   configuration.  These are usually under the administrative control of
   the application or TURN service provider, and not the enterprise,
   ISP, or the network in which the client is located.  Enterprises and
   ISPs wishing to provide their own TURN servers need auto-discovery
   mechanisms that a TURN client could use with minimal or no
   configuration.  This document describes three such mechanisms for
   TURN server discovery.

   This document updates RFC 5766 to relax the requirement for mutual
   authentication in certain cases.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8155.

Patil, et al.                Standards Track                    [Page 1]
RFC 8155               TURN Server Auto Discovery             April 2017

Copyright Notice

   Copyright (c) 2017 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
   (http://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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Discovery Procedure . . . . . . . . . . . . . . . . . . . . .   4
   4.  Discovery Using Service Resolution  . . . . . . . . . . . . .   5
     4.1.  Retrieving Domain Name  . . . . . . . . . . . . . . . . .   5
       4.1.1.  DHCP  . . . . . . . . . . . . . . . . . . . . . . . .   5
       4.1.2.  From Own Identity . . . . . . . . . . . . . . . . . .   6
     4.2.  Resolution  . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  DNS Service Discovery . . . . . . . . . . . . . . . . . . . .   6
     5.1.  mDNS  . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Discovery Using Anycast . . . . . . . . . . . . . . . . . . .   7
   7.  Deployment Considerations . . . . . . . . . . . . . . . . . .   8
     7.1.  Mobility and Changing IP Addresses  . . . . . . . . . . .   8
     7.2.  Recursively Encapsulated TURN . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  IPv4 Anycast  . . . . . . . . . . . . . . . . . . . . . .   9
     8.2.  IPv6 Anycast  . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
     9.1.  Service Resolution  . . . . . . . . . . . . . . . . . . .  12
     9.2.  DNS Service Discovery . . . . . . . . . . . . . . . . . .  12
     9.3.  Anycast . . . . . . . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

Patil, et al.                Standards Track                    [Page 2]
RFC 8155               TURN Server Auto Discovery             April 2017

1.  Introduction

   TURN [RFC5766] is a protocol that is often used to improve the
   connectivity of Peer-to-Peer (P2P) applications (as defined in
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