Network Working Group J. Salowey Request for Comments: 4818 R. Droms Category: Standards Track Cisco Systems, Inc. April 2007 RADIUS Delegated-IPv6-Prefix Attribute Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The IETF Trust (2007).
AbstractThis 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.
1] attribute that carries an IPv6 prefix to be delegated to the user, for use in the user's network. For example, the prefix in a Delegated-IPv6-Prefix attribute can be delegated to another node through DHCP Prefix Delegation . The Delegated-IPv6-Prefix attribute can be used in DHCP Prefix Delegation between the delegating router and a RADIUS server, as illustrated in the following message sequence. Requesting Router Delegating Router RADIUS Server | | | |-Solicit------------>| | | |-Request------------------------>| | |<--Accept(Delegated-IPv6-Prefix)-| |<--Advertise(Prefix)-| | |-Request(Prefix)---->| | |<--Reply(Prefix)-----| | | | | DHCP PD RADIUS The Framed-IPv6-Prefix attribute  is not designed to support delegation of IPv6 prefixes to be used in the user's network, and therefore Framed-IPv6-Prefix and Delegated-IPv6-Prefix attributes may be included in the same RADIUS packet. RFC 2119 .
The Delegated-IPv6-Prefix attribute MAY appear in an Accounting- Request packet. The Delegated-IPv6-Prefix MUST NOT appear in any other RADIUS packets. RFC 3588 , Section 4.1, and RFC 4005 , Section 9. The text in this specification describing the applicability of the Delegated-IPv6-Prefix attribute for RADIUS Access-Request applies in Diameter to AA-Request  or Diameter-EAP-Request . The text in this specification describing the applicability of the Delegated-IPv6-Prefix attribute for RADIUS Access-Accept applies in Diameter to AA-Answer or Diameter-EAP-Answer that indicates success.
The text in this specification describing the applicability of the Delegated-IPv6-Prefix attribute for RADIUS Accounting-Request applies to Diameter Accounting-Request  as well. The AVP flag rules  for the Delegated-IPv6-Prefix attribute are: +---------------------+ | AVP Flag rules | |----+-----+----+-----|----+ AVP | | |SHLD| MUST| | Attribute Name Code Value Type |MUST| MAY | NOT| NOT|Encr| ---------------------------------|----+-----+----+-----|----| Delegated-IPv6- 123 OctetString| M | P | | V | Y | Prefix | | | | | | ---------------------------------|----+-----+----+-----|----| RFC 2607 , RFC 2865 , and RFC 2869 . Use of IPsec  for providing security when RADIUS is carried in IPv6 is discussed in RFC 3162. Security considerations for the Diameter protocol are discussed in RFC 3588 .  Rigney, C., Willens, S., Rubens, A., and W. Simpson, "Remote Authentication Dial In User Service (RADIUS)", RFC 2865, June 2000.  Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6", RFC 3633, December 2003.  Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
 Aboba, B., Zorn, G., and D. Mitton, "RADIUS and IPv6", RFC 3162, August 2001.  Calhoun, P., Loughney, J., Guttman, E., Zorn, G., and J. Arkko, "Diameter Base Protocol", RFC 3588, September 2003.  Calhoun, P., Zorn, G., Spence, D., and D. Mitton, "Diameter Network Access Server Application", RFC 4005, August 2005.  Eronen, P., Hiller, T., and G. Zorn, "Diameter Extensible Authentication Protocol (EAP) Application", RFC 4072, August 2005.  Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy Implementation in Roaming", RFC 2607, June 1999.  Rigney, C., Willats, W., and P. Calhoun, "RADIUS Extensions", RFC 2869, June 2000.  Kent, S. and K. Seo, "Security Architecture for the Internet Protocol", RFC 4301, December 2005.
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