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Versions: 00 01 02 03 04 05 06 07 08 RFC 5446

Network Working Group                                        J. Korhonen
Internet-Draft                                                U. Nilsson
Expires: August 19, 2007                                     TeliaSonera
                                                       February 15, 2007


                   Service Selection for Mobile IPv4
                   draft-korhonen-mip4-service-00.txt

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Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   In some Mobile IPv4 deployments identifying the mobile node or the
   mobility service subscriber is not enough to distinguish between
   multiple services possibly provisioned to the said mobile node and
   its mobility service subscription.  A capability to specify different
   services in addition to the mobile node identity can be leveraged to
   provide flexibility for mobility service providers to provide
   multiple services within a single mobility service subscription.
   This document describes a Service Selection Extension for Mobile IPv4



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   that is intended to assist home agents to make specific service
   selections for the mobility service subscription during the
   registration procedure.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  Service Selection Extension . . . . . . . . . . . . . . . . . . 4
   4.  Processing Considerations . . . . . . . . . . . . . . . . . . . 4
     4.1.  Mobile Node Considerations  . . . . . . . . . . . . . . . . 5
     4.2.  Home Agent Considerations . . . . . . . . . . . . . . . . . 5
     4.3.  Foreign Agent Considerations  . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6
   Intellectual Property and Copyright Statements  . . . . . . . . . . 8





























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1.  Introduction

   Mobile IPv4 [1] has a Network Access Identifier extension (MN-NAI)
   [6] that provides a flexible way to identify mobile nodes using other
   identifiers than IPv4 addresses.  An example of such an identifier is
   the Network Access Identifier (NAI) [2].  In some Mobile IPv4
   deployments, however, just identifying the mobile node or the the
   mobility service subscriber via a proxy representative [7] is not
   enough to distinguish between multiple services possibly provisioned
   to the said mobile node and its mobility service subscription.

   The capability to specify different services in addition to the
   mobile node identity can be leveraged to provide flexibility for
   mobility service providers to provide multiple services within the
   same mobility service subscription.  For example:

   o  Provide an enterprise data access for which the mobility service
      provider hosts connectivity and mobility services on behalf of the
      enterprise.

   o  Provide access to service domains that are otherwise not
      accessible from public networks because of some mobility service
      provider's business reasons.

   o  Provide simultaneous access to different service domains that are
      separated based on policies of the mobility service provider.

   o  Enable easier policy assignment for mobility service providers
      based on the subscribed services.

   o  In absence of the Service Selection extension the home agent may
      provide, based on operator policies, a default service.  For
      example, a plain Internet access could be an operator's default
      mobility service.

   This document describes a Service Selection Extension for Mobile IPv4
   that is intended to assist home agents to make specific service
   selections for the mobility service subscription during the
   registration procedure.  The service selection may affect home agent
   routing decisions and Home Address assignment policies.  The Service
   Selection extension should be used in combination with the Mobile
   Node Identifier extension during the initial registration at the
   beginning of the mobility session.


2.  Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",



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   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [3].


3.  Service Selection Extension

   The Service Selection extension can be included in any Mobile IPv4
   Registration Request message.  If the Registration Request message
   includes any authentication-enabling extensions [1][8], then the
   Service Selection extension MUST appear before any authentication-
   enabling extensions.

   This extension MAY be included in the initial Registration Request
   message when registering to a home agent at the beginning of the
   mobility session.  The MN-NAI extension SHOULD also be included in
   the Registration Request message when the Service Selection extension
   is used.  Sending the Service Selection extension in any Registration
   Request message is not prohibited.


    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Type = TBD   |   Length      | Identifier...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                        Service Selection Extension

   o  Type: 8-bit identifier set to TBD (to be defined by IANA) of the
      type of this skippable extension.

   o  Length: 8-bit unsigned integer, representing the length of the
      Service Selection Identifier field.

   o  Identifier: A variable length service identifier string used to
      identify the requested service.  The Identifier string is encoded
      as a host name or a fully qualified domain name as defined in [4]
      and [5].

      'deadcoderssociety' and 'deadcoderssociety.example.com' are valid
      examples of Service Selection extension Identifier strings.


4.  Processing Considerations







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4.1.  Mobile Node Considerations

   A mobile node or its proxy representative MAY include the Service
   Selection extension into any Registration Request message.  The
   extension is used to identify the service to be associated with the
   mobility session and SHOULD only be included into the initial
   Registration Request message sent to a home agent.  The provisioning
   of the service identifiers to the mobile node or its proxy
   representative is out of scope of this specification.

   The placement of the Service Selection extension is as follows: when
   present this extension MUST appear after the MN-NAI extension and
   before any authentication related extensions.  The Service Selection
   extension is intended to be used with the MN-NAI extension, but it is
   also possible to use Home Address to identify the mobile node as
   defined in [1].

4.2.  Home Agent Considerations

   Upon receiving the Service Selection extension the home agent
   authenticates and authorizes the mobile node.  The Service Selection
   extension is used to assist the authorization and identifies a
   specific service that is to be authorized.

   The Service Selection extension MAY also affect the Home Address
   allocation when for example used with the MN-NAI extension.  For the
   same NAI there MAY be different Home Addresses depending on the
   identified service.  Furthermore, the Service Selection extension MAY
   also affect the routing of the outbound IP packets in the home agent
   depending on the selected service.

4.3.  Foreign Agent Considerations

   A foreign agent MUST ignore the Service Selection extension.


5.  Security Considerations

   The protection for the Service Selection extension depends on the
   service that is being identified and eventually selected.  If the
   service selection information should not be revealed on the wire it
   should be protected in a manner similar to Registration Requests and
   Registration Replies.


6.  IANA Considerations

   A new Mobile IPv4 Extension type is required for the following new



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   extension described in Section 3:

       Service Selection Extension       is set to TBD


7.  Acknowledgements

   TBD.


8.  References

8.1.  Normative References

   [1]  Perkins, C., "IP Mobility Support for IPv4", RFC 3344,
        August 2002.

   [2]  Aboba, B., Beadles, M., Arkko, J., and P. Eronen, "The Network
        Access Identifier", RFC 4282, December 2005.

   [3]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.

   [4]  Mockapetris, P., "Domain names - implementation and
        specification", STD 13, RFC 1035, November 1987.

   [5]  Faltstrom, P., Hoffman, P., and A. Costello, "Internationalizing
        Domain Names in Applications (IDNA)", RFC 3490, March 2003.

8.2.  Informative References

   [6]  Calhoun, P. and C. Perkins, "Mobile IP Network Access Identifier
        Extension for IPv4", RFC 2794, March 2000.

   [7]  Leung, K., "Mobility Management using Proxy Mobile IPv4",
        draft-leung-mip4-proxy-mode-02 (work in progress), January 2007.

   [8]  Perkins, C., Calhoun, P., and J. Bharatia, "Mobile IPv4
        Challenge/Response Extensions (Revised)", RFC 4721,
        January 2007.











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Authors' Addresses

   Jouni Korhonen
   TeliaSonera Corporation.
   P.O.Box 970
   FIN-00051 Sonera
   FINLAND

   Email: jouni.korhonen@teliasonera.com


   Ulf Nilsson
   TeliaSonera Corporation.
   Marbackagatan 11
   S-123 86 Farsta
   SWEDEN

   Email: ulf.s.nilsson@teliasonera.com

































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Full Copyright Statement

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Acknowledgment

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