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Port Control Protocol (PCP) Proxy Function
draft-ietf-pcp-proxy-05

Document type: Active Internet-Draft (pcp WG)
Document stream: IETF
Last updated: 2014-02-04
Intended RFC status: Unknown
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IETF State: WG Document
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Network Working Group                                  S. Perreault, Ed.
Internet-Draft                                                  Viagenie
Intended status: Standards Track                            M. Boucadair
Expires: August 02, 2014                                  France Telecom
                                                                R. Penno
                                                                 D. Wing
                                                                   Cisco
                                                             S. Cheshire
                                                                   Apple
                                                        January 29, 2014

               Port Control Protocol (PCP) Proxy Function
                        draft-ietf-pcp-proxy-05

Abstract

   This document specifies a new PCP functional element denoted as a PCP
   Proxy.  The PCP Proxy relays PCP requests received from PCP clients
   to upstream PCP server(s).  A typical deployment usage of this
   function is to help establish successful PCP communications for PCP
   clients that can not be configured with the address of a PCP server
   located more than one hop away.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 02, 2014.

Copyright Notice

   Copyright (c) 2014 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

Perreault, et al.        Expires August 02, 2014                [Page 1]
Internet-Draft                  PCP Proxy                   January 2014

   (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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Use Case: the NAT Cascade . . . . . . . . . . . . . . . .   3
     1.2.  Use Case: the PCP Relay . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Operation of the PCP Proxy  . . . . . . . . . . . . . . . . .   5
     3.1.  Optimized Hairpin Routing . . . . . . . . . . . . . . . .   7
     3.2.  Termination of Recursion  . . . . . . . . . . . . . . . .   8
     3.3.  Source Address for PCP Requests Sent Upstream . . . . . .   8
     3.4.  Unknown OpCodes and Options . . . . . . . . . . . . . . .   9
     3.5.  Mapping Repair  . . . . . . . . . . . . . . . . . . . . .   9
     3.6.  Multiple PCP Servers  . . . . . . . . . . . . . . . . . .  10
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   This document defines a new PCP [RFC6887] functional element: the PCP
   Proxy.  As shown in Figure 1, the PCP proxy is logically equivalent
   to a PCP client back-to-back with a PCP server.  The "glue" between
   the two is what is specified in this document.  Other than that
   "glue", the server and the client behave exactly like their regular
   counterparts.

                              .................
              +------+       : +------+------+ :    +------+
              |Client|-------:-|Server|Client|-:----|Server|
              +------+       : +------+------+ :    +------+
                             :      Proxy      :

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