Using PCP to Reveal a Host behind NAT
draft-boucadair-pcp-nat-reveal-00

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PCP Working Group                                           M. Boucadair
Internet-Draft                                            France Telecom
Intended status: Standards Track                                T. Reddy
Expires: June 1, 2013                                           P. Patil
                                                                 D. Wing
                                                                   Cisco
                                                       November 28, 2012

                 Using PCP to Reveal a Host behind NAT
                   draft-boucadair-pcp-nat-reveal-00

Abstract

   This document describes how to use PCP to retrieve the identify of a
   host behind a NAT.  Two use cases are discussed and the PCP
   applicability is analyzed.  This document extends PCP with a new
   OpCode: QUERY.

   The proposed mechanism is valid for all NAT flavors including NAT44,
   NAT64 or NPTv6.

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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   This Internet-Draft will expire on June 1, 2013.

Copyright Notice

   Copyright (c) 2012 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

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   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.  Requirements Language and Terminology  . . . . . . . . . . . .  3
   3.  Problem Space  . . . . . . . . . . . . . . . . . . . . . . . .  3
     3.1.  Policy and Charging Control Architecture . . . . . . . . .  3
     3.2.  NAT between the PCEF and AF  . . . . . . . . . . . . . . .  4
     3.3.  NAT before PCEF  . . . . . . . . . . . . . . . . . . . . .  6
   4.  PCP Applicability  . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  NAT between the PCEF and AF  . . . . . . . . . . . . . . .  7
     4.2.  NAT before PCEF  . . . . . . . . . . . . . . . . . . . . .  8
   5.  QUERY OpCode . . . . . . . . . . . . . . . . . . . . . . . . .  9
     5.1.  QUERY Request Format . . . . . . . . . . . . . . . . . . . 10
     5.2.  QUERY Response Format  . . . . . . . . . . . . . . . . . . 11
     5.3.  Generating a QUERY Request . . . . . . . . . . . . . . . . 12
     5.4.  Processing a QUERY Request . . . . . . . . . . . . . . . . 12
     5.5.  Processing a QUERY Response  . . . . . . . . . . . . . . . 13
   6.  Applicability Scope of QUERY OpCode  . . . . . . . . . . . . . 13
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

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1.  Introduction

   As reported in [RFC6269], several issues are encountered when an IP
   address is shared among several subscribers.  These issues are
   encountered in various deployment contexts: e.g., Carrier Grade NAT
   (CGN), application proxies or A+P [RFC6346].

   This document extends Port Control Protocol [I-D.ietf-pcp-base] to
   identify a host among those sharing the same IP address in certain
   scenarios.

   The proposed technique can be used independently or combined with the
   host identifier, denoted as HOST_ID defined in
   [I-D.ietf-intarea-nat-reveal-analysis].
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