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Analysis of Potential Solutions for Revealing a Host Identifier (HOST_ID) in Shared Address Deployments
RFC 6967

Internet Engineering Task Force (IETF)                      M. Boucadair
Request for Comments: 6967                                France Telecom
Category: Informational                                         J. Touch
ISSN: 2070-1721                                                  USC/ISI
                                                                P. Levis
                                                          France Telecom
                                                                R. Penno
                                                                   Cisco
                                                               June 2013

            Analysis of Potential Solutions for Revealing a
        Host Identifier (HOST_ID) in Shared Address Deployments

Abstract

   This document is a collection of potential solutions for revealing a
   host identifier (denoted as HOST_ID) when a Carrier Grade NAT (CGN)
   or application proxies are involved in the path.  This host
   identifier could be used by a remote server to sort packets according
   to the sending host.  The host identifier must be unique to each host
   under the same shared IP address.

   This document analyzes a set of potential solutions for revealing a
   host identifier and does not recommend a particular solution,
   although it does highlight the hazards of some approaches.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are 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/rfc6967.

Boucadair, et al.             Informational                     [Page 1]
RFC 6967                    Revealing HOST_ID                  June 2013

Copyright Notice

   Copyright (c) 2013 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.

Boucadair, et al.             Informational                     [Page 2]
RFC 6967                    Revealing HOST_ID                  June 2013

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  On HOST_ID  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  HOST_ID and Privacy . . . . . . . . . . . . . . . . . . . . .   6
   4.  Detailed Solutions Analysis . . . . . . . . . . . . . . . . .   8
     4.1.  Use the Identification Field of the IPv4 Header (IP-ID) .   8
       4.1.1.  Description . . . . . . . . . . . . . . . . . . . . .   8
       4.1.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Define an IP Option . . . . . . . . . . . . . . . . . . .   9
       4.2.1.  Description . . . . . . . . . . . . . . . . . . . . .   9
       4.2.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .   9
     4.3.  Define a TCP Option . . . . . . . . . . . . . . . . . . .   9
       4.3.1.  Description . . . . . . . . . . . . . . . . . . . . .   9
       4.3.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Inject Application Protocol Message Headers . . . . . . .  11
       4.4.1.  Description . . . . . . . . . . . . . . . . . . . . .  11
       4.4.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .  12
     4.5.  PROXY Protocol  . . . . . . . . . . . . . . . . . . . . .  13
       4.5.1.  Description . . . . . . . . . . . . . . . . . . . . .  13
       4.5.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .  13
     4.6.  Assign Port Sets  . . . . . . . . . . . . . . . . . . . .  14
       4.6.1.  Description . . . . . . . . . . . . . . . . . . . . .  14
       4.6.2.  Analysis  . . . . . . . . . . . . . . . . . . . . . .  14
     4.7.  Host Identity Protocol (HIP)  . . . . . . . . . . . . . .  14
       4.7.1.  Description . . . . . . . . . . . . . . . . . . . . .  14

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