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Versions: (draft-salowey-radext-delegated-prefix) 00 01 02 03 04 05 RFC 4818

Network Working Group                                         J. Salowey
Internet-Draft                                                  R. Droms
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: November 24, 2006                                  May 23, 2006


                 RADIUS Delegated-IPv6-Prefix Attribute
               draft-ietf-radext-delegated-prefix-01.txt

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Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document defines a RADIUS (Remote Authentication Dial In User
   Service) attribute that carries an IPv6 prefix that is to be
   delegated to the user.  This attribute is usable within either RADIUS
   or Diameter.







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1.  Introduction

   The Delegated-IPv6-Prefix is a RADIUS attribute [1] that carries an
   IPv6 prefix to be delegated to the user.  For example, the prefix in
   a Delegated-IPv6-Prefix attribute can be delegated to another node
   through DHCP Prefix Delegation [2].


2.  Terminology

   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 [3].


3.  Attribute format

   The format of the Delegated-IPv6-Prefix is:

       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     |  Reserved     | Prefix-Length |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   Prefix
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   Prefix
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   Prefix
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   Prefix                             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


       Type

            TBD for Delegated-IPv6-Prefix

       Length

            At least 4 and no larger than 20

       Reserved

            Always set to zero






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       Prefix-Length

            The length of the prefix, in bits.  At least 0 and no larger
            than 128

   Note that the prefix field is only required to be long enough to hold
   the prefix bits and can be shorter than 16 bytes.  Any bits in the
   prefix field that are not part of the prefix MUST be zero.

   The definition of the Delegated-IPv6-Prefix Attribute is based on the
   Framed-IPv6-Prefix attribute.

   The Delegated-IPv6-Prefix MAY appear in an Access-Accept packet, and
   can appear multiple times.  It MAY appear in an Access-Request packet
   as a hint by the NAS to the server that it would prefer these
   prefix(es), but the server is not required to honor the hint.

   The Delegated-IPv6-Prefix attribute MAY appear in an Accounting-
   Request packet.

   The Delegated-IPv6-Prefix MUST NOT appear in any other RADIUS
   packets.

   The following table describes which messages the Delegated-IPv6-
   Prefix attribute can appear in and in what quantity.

   Request Accept Accounting  #   Attribute
                  Request
   0+      0+     0+          TBD Delegated-IPv6-Prefix

   In this table 0+ means that zero or more instances of this attribute
   MAY be present in packet.  This attribute MUST NOT appear in any
   packet not listed in the table.


4.  Diameter Considerations

   A definition is needed for an identical attribute with the same Type
   value for Diameter [4].  The attribute should be available as part of
   the NASREQ application [5], as well as the Diameter EAP application
   [6].


5.  IANA Considerations

   IANA is requested to assign a Type value, TBD, for this attribute
   from the RADIUS Types registry.




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6.  Security Considerations

   Known security vulnerabilities of the RADIUS protocol are discussed
   in RFC 2607 [7], RFC 2865 [1] and RFC 2869 [8].  Use of IPsec [9] for
   providing security when RADIUS is carried in IPv6 is discussed in RFC
   3162 [10].


7.  Change Log

   The following changes were made in revision -01 of this document:
   o  Added additional details to Abstract; defined that this attribute
      can be used in both RADIUS and Diameter.  (Issue 188)
   o  Moved and clarified text describing which packets this attribute
      can appear in adjacent to table in section 3.  (Issue 188)
   o  Fixed RFC 2119 boilerplate in section 2.  (Issue 185)
   o  Fixed table in section 3 to clarify which packets this attribute
      cannot appear in.  (Issue 188)
   o  Added section 4, Diameter Considerations.  (Issue 188)
   o  Made some references in section 6, Security Considerations,
      Informative rather than Normative.  (Issue 188)
   o  Updated reference to RFC 2401 [9] to RFC 4301.  (Issue 188)
   o  Changed "IP SEC" to "IPsec" in section 6.  (Issues 185 and 188)


8.  References

8.1.  Normative References

   [1]  Rigney, C., Willens, S., Rubens, A., and W. Simpson, "Remote
        Authentication Dial In User Service (RADIUS)", RFC 2865,
        June 2000.

   [2]  Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic Host
        Configuration Protocol (DHCP) version 6", RFC 3633,
        December 2003.

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

8.2.  Non-normative References

   [4]   Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko,
         "Diameter Base Protocol", RFC 3588, September 2003.

   [5]   Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter
         Network Access Server Application", RFC 4005, August 2005.




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   [6]   Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible
         Authentication Protocol (EAP) Application", RFC 4072,
         August 2005.

   [7]   Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy
         Implementation in Roaming", RFC 2607, June 1999.

   [8]   Rigney, C., Willats, W., and P. Calhoun, "RADIUS Extensions",
         RFC 2869, June 2000.

   [9]   Kent, S. and K. Seo, "Security Architecture for the Internet
         Protocol", RFC 4301, December 2005.

   [10]  Aboba, B., Zorn, G., and D. Mitton, "RADIUS and IPv6",
         RFC 3162, August 2001.


Authors' Addresses

   Joe Salowey
   Cisco Systems, Inc.
   2901 Third Avenue
   Seattle, WA  98121
   USA

   Phone: +1 206.310.0596
   Email: jsalowey@cisco.com


   Ralph Droms
   Cisco Systems, Inc.
   1414 Massachusetts Avenue
   Boxborough, MA  01719
   USA

   Phone: +1 978.936.1674
   Email: rdroms@cisco.com














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