IPv6 Tunnel Broker with the Tunnel Setup Protocol (TSP)
RFC 5572

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Independent Submission                                       M. Blanchet
Request for Comments: 5572                                      Viagenie
Category: Experimental                                         F. Parent
ISSN: 2070-1721                                           Beon Solutions
                                                           February 2010

        IPv6 Tunnel Broker with the Tunnel Setup Protocol (TSP)

Abstract

   A tunnel broker with the Tunnel Setup Protocol (TSP) enables the
   establishment of tunnels of various inner protocols, such as IPv6 or
   IPv4, inside various outer protocols packets, such as IPv4, IPv6, or
   UDP over IPv4 for IPv4 NAT traversal.  The control protocol (TSP) is
   used by the tunnel client to negotiate the tunnel with the broker.  A
   mobile node implementing TSP can be connected to both IPv4 and IPv6
   networks whether it is on IPv4 only, IPv4 behind a NAT, or on IPv6
   only.  A tunnel broker may terminate the tunnels on remote tunnel
   servers or on itself.  This document describes the TSP within the
   model of the tunnel broker model.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This is a contribution to the RFC Series, independently
   of any other RFC stream.  The RFC Editor has chosen to publish this
   document at its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see 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/rfc5572.

IESG Note

   The content of this RFC was at one time considered by the IETF, and
   therefore it may resemble a current IETF work in progress or a
   published IETF work.

Blanchet & Parent             Experimental                      [Page 1]
RFC 5572               Tunnel Setup Protocol (TSP)         February 2010

Copyright Notice

   Copyright (c) 2010 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.

Blanchet & Parent             Experimental                      [Page 2]
RFC 5572               Tunnel Setup Protocol (TSP)         February 2010

Table of Contents

   1. Introduction ....................................................4
   2. Description of the TSP Framework ................................4
      2.1. NAT Discovery ..............................................6
      2.2. Any Encapsulation ..........................................6
      2.3. Mobility ...................................................6
   3. Advantages of TSP ...............................................7
   4. Protocol Description ............................................7
      4.1. Terminology ................................................7
      4.2. Topology ...................................................8
      4.3. Overview ...................................................8
      4.4. TSP Signaling ..............................................9
           4.4.1. Signaling Transport .................................9
           4.4.2. Authentication Phase ...............................11
           4.4.3. Command and Response Phase .........................14
      4.5. Tunnel Establishment ......................................16
           4.5.1. IPv6-over-IPv4 Tunnels .............................16
           4.5.2. IPv6-over-UDP Tunnels ..............................16
      4.6. Tunnel Keep-Alive .........................................16
      4.7. XML Messaging .............................................17
           4.7.1. Tunnel .............................................17
           4.7.2. Client Element .....................................18
           4.7.3. Server Element .....................................19
           4.7.4. Broker Element .....................................19
   5. Tunnel Request Examples ........................................19
      5.1. Host Tunnel Request and Reply .............................19
      5.2. Router Tunnel Request with a /48 Prefix Delegation
           and Reply .................................................20
      5.3. IPv4 over IPv6 Tunnel Request .............................22
      5.4. NAT Traversal Tunnel Request ..............................23