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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