Traversal Using Relays around NAT (TURN) Extension for IPv6
RFC 6156

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Internet Engineering Task Force (IETF)                      G. Camarillo
Request for Comments: 6156                                       O. Novo
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                        S. Perreault, Ed.
                                                                Viagenie
                                                              April 2011

      Traversal Using Relays around NAT (TURN) Extension for IPv6

Abstract

   This document adds IPv6 support to Traversal Using Relays around NAT
   (TURN).  IPv6 support in TURN includes IPv4-to-IPv6, IPv6-to-IPv6,
   and IPv6-to-IPv4 relaying.  This document defines the REQUESTED-
   ADDRESS-FAMILY attribute for TURN.  The REQUESTED-ADDRESS-FAMILY
   attribute allows a client to explicitly request the address type the
   TURN server will allocate (e.g., an IPv4-only node may request the
   TURN server to allocate an IPv6 address).

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 5741.

   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/rfc6156.

Copyright Notice

   Copyright (c) 2011 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.

Camarillo, et al.            Standards Track                    [Page 1]
RFC 6156         TURN Extension for IPv4/IPv6 Transition      April 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Overview of Operation  . . . . . . . . . . . . . . . . . . . .  3
   4.  Creating an Allocation . . . . . . . . . . . . . . . . . . . .  4
     4.1.  Sending an Allocate Request  . . . . . . . . . . . . . . .  4
       4.1.1.  The REQUESTED-ADDRESS-FAMILY Attribute . . . . . . . .  4
     4.2.  Receiving an Allocate Request  . . . . . . . . . . . . . .  5
       4.2.1.  Unsupported Address Family . . . . . . . . . . . . . .  6
     4.3.  Receiving an Allocate Error Response . . . . . . . . . . .  6
   5.  Refreshing an Allocation . . . . . . . . . . . . . . . . . . .  6
     5.1.  Sending a Refresh Request  . . . . . . . . . . . . . . . .  6
     5.2.  Receiving a Refresh Request  . . . . . . . . . . . . . . .  6
   6.  CreatePermission . . . . . . . . . . . . . . . . . . . . . . .  6
     6.1.  Sending a CreatePermission Request . . . . . . . . . . . .  6
     6.2.  Receiving a CreatePermission Request . . . . . . . . . . .  7
       6.2.1.  Peer Address Family Mismatch . . . . . . . . . . . . .  7
   7.  Channels . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     7.1.  Sending a ChannelBind Request  . . . . . . . . . . . . . .  7
     7.2.  Receiving a ChannelBind Request  . . . . . . . . . . . . .  7
   8.  Packet Translations  . . . . . . . . . . . . . . . . . . . . .  7
     8.1.  IPv4-to-IPv6 Translations  . . . . . . . . . . . . . . . .  8
     8.2.  IPv6-to-IPv6 Translations  . . . . . . . . . . . . . . . .  9
     8.3.  IPv6-to-IPv4 Translations  . . . . . . . . . . . . . . . . 10
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
     9.1.  Tunnel Amplification Attack  . . . . . . . . . . . . . . . 11
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
     10.1. New STUN Attribute . . . . . . . . . . . . . . . . . . . . 12
     10.2. New STUN Error Codes . . . . . . . . . . . . . . . . . . . 13
   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 13
     12.2. Informative References . . . . . . . . . . . . . . . . . . 13

Camarillo, et al.            Standards Track                    [Page 2]
RFC 6156         TURN Extension for IPv4/IPv6 Transition      April 2011

1.  Introduction

   Traversal Using Relays around NAT (TURN) [RFC5766] is a protocol that