Scenarios with Host Identification Complications
RFC 7620

Document Type RFC - Informational (August 2015; No errata)
Last updated 2015-10-14
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Independent Submission                                 M. Boucadair, Ed.
Request for Comments: 7620                                    B. Chatras
Category: Informational                                           Orange
ISSN: 2070-1721                                                 T. Reddy
                                                           Cisco Systems
                                                             B. Williams
                                                            Akamai, Inc.
                                                             B. Sarikaya
                                                                  Huawei
                                                             August 2015

            Scenarios with Host Identification Complications

Abstract

   This document describes a set of scenarios in which complications
   when identifying which policy to apply for a host are encountered.
   This problem is abstracted as "host identification".  Describing
   these scenarios allows commonalities between scenarios to be
   identified, which is helpful during the solution design phase.

   This document does not include any solution-specific discussions.

IESG Note

   This document describes use cases where IP addresses are overloaded
   with both location and identity properties.  Such semantic
   overloading is seen as a contributor to a variety of issues within
   the routing system [RFC4984].  Additionally, these use cases may be
   seen as a way to justify solutions that are not consistent with IETF
   Best Current Practices on protecting privacy [BCP160] [BCP188].

Status of This Memo

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

   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/rfc7620.

Boucadair, et al.             Informational                     [Page 1]
RFC 7620             Host Identification: Scenarios          August 2015

Copyright Notice

   Copyright (c) 2015 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Scenario 1: Carrier-Grade NAT (CGN) . . . . . . . . . . . . .   4
   4.  Scenario 2: Address plus Port (A+P) . . . . . . . . . . . . .   5
   5.  Scenario 3: On-Premise Application Proxy Deployment . . . . .   6
   6.  Scenario 4: Distributed Proxy Deployment  . . . . . . . . . .   7
   7.  Scenario 5: Overlay Network . . . . . . . . . . . . . . . . .   8
   8.  Scenario 6: Policy and Charging Control Architecture (PCC)  .  10
   9.  Scenario 7: Emergency Calls . . . . . . . . . . . . . . . . .  12
   10. Other Deployment Scenarios  . . . . . . . . . . . . . . . . .  13
     10.1.  Open WLAN or Provider WLAN . . . . . . . . . . . . . . .  13
     10.2.  Cellular Networks  . . . . . . . . . . . . . . . . . . .  14
     10.3.  Femtocells . . . . . . . . . . . . . . . . . . . . . . .  14
     10.4.  Traffic Detection Function (TDF) . . . . . . . . . . . .  17
     10.5.  Fixed and Mobile Network Convergence . . . . . . . . . .  18
   11. Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . .  21
   12. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  21
   13. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   14. Informative References  . . . . . . . . . . . . . . . . . . .  22
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  25
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  25
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

Boucadair, et al.             Informational                     [Page 2]
RFC 7620             Host Identification: Scenarios          August 2015

1.  Introduction

   The goal of this document is to enumerate scenarios that encounter
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