Experimental Option for TCP Host Identification

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Document Type Active Internet-Draft (individual)
Last updated 2014-10-24
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Intended RFC status Experimental
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Network Working Group                                        B. Williams
Internet-Draft                                              Akamai, Inc.
Intended status:  Experimental                              M. Boucadair
Expires:  April 27, 2015                                  France Telecom
                                                                 D. Wing
                                                     Cisco Systems, Inc.
                                                        October 24, 2014

            Experimental Option for TCP Host Identification


   Recent IETF proposals have identified benefits to more distinctly
   identifying the hosts that are hidden behind a shared address/prefix
   sharing device or application-layer proxy.  Analysis indicates that
   the use of a TCP option for this purpose can be successfully applied
   to a broad range of use cases.  This document describes a common
   experimental TCP option format for host identification.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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 April 27, 2015.

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
   (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

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   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.

1.  Introduction

   A broad range of issues associated with address sharing have been
   well documented in [RFC6269] and
   [I-D.boucadair-intarea-host-identifier-scenarios].  In addition,
   [RFC6967] provides analysis of various solutions to the problem of
   revealing the sending host's identifier (HOST_ID) information to the
   receiver, indicating that a solution using a TCP [RFC0793] option for
   this purpose is among the possible approaches that could be applied
   with limited performance impact and a high success ratio.  The
   purpose of this document is to define such a TCP option in order to
   factilitate further validation of the mechanism.

   Multiple recent Internet Drafts define TCP options for the purpose of
   host identification:  [I-D.wing-nat-reveal-option],
   [I-D.abdo-hostid-tcpopt-implementation], and
   [I-D.williams-overlaypath-ip-tcp-rfc].  Specification of multiple
   option formats to serve the purpose of host identification increases
   the burden for potential implementers and presents interoperability
   challenges as well.  This document defines a common TCP option format
   that supersedes all three of the above proposals.

   The option defined in this document uses the TCP experimental option
   codepoint sharing mechanism defined in [RFC6994] and is intended to
   allow broad deployment of the mechanism on the public Internet in
   order to validate the utility of this option format for the intended
   use cases.

   Section 5 of this document discusses compatibility between this new
   TCP option and existing commonly deployed TCP options.

1.1.  Important Use Cases

   This memo focuses primarily on the carrier grade NAT (CGN),
   application proxy, and overlay network use cases described in
   [I-D.boucadair-intarea-host-identifier-scenarios].  This means that
   the option could either be applied to an individual TCP packet at the
   connection endpoint (e.g. an application proxy or a transport layer
   overlay network) or at an address-sharing middle box (e.g. a CGN or a
   network layer overlay network).  See Section 4 below for additional
   details about the types of devices that could add the option to a TCP
   packet, as well as limitations on use of the option when it is to be

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