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INTERNET DRAFT                                             Mohamed M Khalil
Category: Standards Track                                  Emad Qaddoura
Title: draft-ietf-mobileip-gnaie-05.txt                    Haseeb Akhtar
Date: October 2001                                          Nortel Networks
Expires:  March 2002                                       Pat R. Calhoun
                                                            Black Storm Networks



               Generalized NAI (GNAI) Extension for Mobile IPv4



Status of this Memo

   This document is a submission by the mobile-ip Working Group of the
   Internet Engineering Task Force (IETF).  Comments should be submitted
   to the mobile-ip@sunroof.eng.sun.com mailing list.

   Distribution of this memo is unlimited.

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   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."

   The list of current Internet-Drafts can be accessed at:
      http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at:
      http://www.ietf.org/shadow.html.

   Copyright   (C) The Internet Society 2001.  All Rights Reserved.


Abstract

   The IP Mobility Support for IPv4, revised [4] specification defines
   a new extension header format, that is intended to extend the Mobile
   IP extension address space. This document defines the Generalized
   Network Access Identifier (GNAI) extension, which SHOULD be used by
   any Mobile IP extension specifying an extension containing an NAI.



Khalil, Qaddoura, Akhtar, Calhoun                               [Page 1]


INTERNET DRAFT                                                  October 2001


Table of Contents

      1.0  Introduction
      2.0  Specification Language
      3.0  Generalized NAI (GNAI) Extension
           3.1 Processing Of the GNAI Extension
      4.0  IANA Considerations
      5.0  Security Considerations
      6.0  References
      7.0  Authors' Address
      8.0  Full Copyright Statement


1.0 Introduction

   The IP Mobility Support for IPv4, revised specification [4] defines
   a new extension header format, that is intended to extend the
   Mobile IP extension address space. The use of a Network Access
   Identifier for Mobile Nodes for Mobile IPv4 is specified in [2].
   This work extends this idea by specifying NAIs for other Mobile
   IPv4 network elements such as the Foreign Agent and the Home agent
   in an extension format that optimizes the number space for new
   extensions. This specification does not define a sub-type to carry
   a Mobile Node's NAI, since this is already defined in [2].

2.0 Specification Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [1].


3.0 A Generalized NAI (GNAI) Extension

   This section defines the GNAI Extension, used by any extension
   that must carry data in the format of an NAI [2].  This extension
   may be carried by Registration Request and Reply messages.

        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      |   Length      |   Sub-Type    |    NAI ...
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      (Type to be assigned by IANA) (skippable) [4]

   Length

      8-bit unsigned integer. Length of the extension, in octets,
      excluding the extension Type and the extension Length fields.
      This field MUST be set to 1 plus the total length of the NAI
      field.



Khalil, Qaddoura, Akhtar, Calhoun                               [Page 2]


INTERNET DRAFT                                                  October 2001


   Sub-Type

      This field describes the type of the entity which owns the NAI.
      The following subtypes are defined:

         1    HA_NAI
         2    FA_NAI
    NAI

      Contains the NAI [3] in a string format.

3.1 Processing of GNAI Extension

      When a mobile node or home agent adds a GNAI extension to a
      registration message, the extension MUST appear prior to any
      authentication extensions.

      In the event the Foreign Agent adds an GNAI extension to a
      registration message, the extension MUST appear prior to any
      authentication extensions added by the FA.



4.0 IANA Considerations

   The value assigned to the Generalized NAI extension, specified in
   section 3.0, MUST be from the IANA number space for mobile IPv4
   skippable extensions. This value MUST NOT conflict with any value
   assigned to RFC 3024[6] RFC 2356 [7], RFC 3012 [8], RFC 3115 [9].

5.0 Security Considerations

   This specification introduces new Mobile IP extensions that are used
   to carry mobility agent identities, in the form of Network Access
   Identifiers. It is assumed that the Mobile IP messages that would
   carry these extensions would be authenticated in the manner that is
   described in [4], or any follow-on authentication mechanisms.
   Therefore, this specification does not lessen the security of Mobile
   IP messages.

   It should be noted, that the identities sent in the extensions
   specified herein MAY be sent in the clear over the network.  However,
   the authors do not envision that this information would create any










Khalil, Qaddoura, Akhtar, Calhoun                               [Page 3]


INTERNET DRAFT                                                  October 2001


   security issues.


6.0  References

      [1]  Scott Bradner.  Key words for use in RFCs to Indicate
           Requirement Levels.  RFC 2119, March 1997.

      [2]  Calhoun, Perkins. Mobile IP Network Access Identifier Exten-
           sion for IPv4. RFC 2794, March 2000.

      [3]  Aboba, Beadles. The Network Access Identifier. RFC 2486,
           January 1999

      [4] C. Perkins, editor. IP Mobility Support for IPv4, revised
           draft-ietf-mobileip-rfc2002-bis-08.txt, 19 September 2001.

      [5]  J. Reynolds, J. Postel. Assigned Numbers. STD 2, RFC 1700,
           USC/Information Sciences Institute, October 1994.

      [6]  G. Montenegro. Reverse Tunneling for Mobile IP, revised. RFC
           RFC3024, January 2001.

      [7]  G. Montenegro, V. Gupta. Sun's SKIP Firewall Traversal for
           Mobile IP.  RFC 2356, June 1998.

      [8]  C. Perkins,  P. Calhoun. Mobile IPv4 Challenge/Response
           Extensions.  RFC 3012 , November 2000.

      [9]  G. Dommety, K. Leung. Mobile IP Vendor/Organization-Specific
           Extensions. RFC 3115, April 2001.


      [10] T. Narten, H, Alvestrand. Guidelines for Writing an IANA Con-
           siderations Section in RFCs. BCP 26, RFC 2434, October 1998















Khalil, Qaddoura, Akhtar, Calhoun                               [Page 4]


INTERNET DRAFT                                                  October 2001


7.0  Authors' Address

   Questions about this memo can be directed to:

      Mohamed M Khalil
      Wireless Technology Labs
      Nortel Networks
      2221 Lakeside Blvd.
      Richardson, TX 75082-4399 USA
      Phone: 1-972-685-0564
      E-Mail: mkhalil@nortelnetworks.com


      Emad Qaddoura
      Wireless Technology Labs
      Nortel Networks
      2221 Lakeside Blvd.
      Richardson, TX 75082-4399 USA
      Phone: 1-972-684-2705
      E-Mail: emadq@nortelnetworks.com


      Haseeb Akhtar
      Wireless Technology Labs
      Nortel Networks
      2221 Lakeside Blvd.
      Richardson, TX 75082-4399 USA
      Phone: 1-972-684-8850
      E-Mail: haseeb@nortelnetworks.com


      Pat R. Calhoun

      Black Storm Networks
      250 Cambridge Avenue, Suite 200
      Palo Alto, California, 94306 USA
      Phone:  +1 650-617-2932
      Email:  pcalhoun@bstormnetworks.com
      Fax:  +1 650-786-6445






Khalil, Qaddoura, Akhtar, Calhoun                               [Page 5]


INTERNET DRAFT                                                  October 2001


8.0  Full Copyright Statement

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works. However, this docu-
   ment itself may not be modified in any way, such as by removing the
   copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of develop-
   ing Internet standards in which case the procedures for copyrights
   defined in the Internet Standards process must be followed, or as
   required to translate it into languages other than English. The lim-
   ited permissions granted above are perpetual and will not be revoked
   by the Internet Society or its successors or assigns. This document
   and the information contained herein is provided on an "AS IS" basis
   and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DIS-
   CLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
   TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT
   INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
   FITNESS FOR A PARTICULAR PURPOSE.
























Khalil, Qaddoura, Akhtar, Calhoun                               [Page 6]


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