RADIUS attribute from rfc3162

Framed-IPv6-Pool

This Attribute contains the name of an assigned pool that SHOULD
be used to assign an IPv6 prefix for the user. If a NAS does not
support multiple prefix pools, the NAS MUST ignore this Attribute.

A summary of the Framed-IPv6-Pool Attribute format is shown below.
The fields are transmitted from left to right.

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

Type

100 for Framed-IPv6-Pool

Length

>= 3

String

The string field contains the name of an assigned IPv6 prefix pool
configured on the NAS. The field is not NUL (hex 00) terminated.3. Table of AttributesThe following table provides a guide to which attributes may be found
in which kinds of packets, and in what quantity.

Request Accept Reject Challenge Accounting # Attribute
Request
0-1 0 0 0 0-1 95 NAS-IPv6-Address
0-1 0-1 0 0 0-1 96 Framed-Interface-Id
0+ 0+ 0 0 0+ 97 Framed-IPv6-Prefix
0+ 0+ 0 0 0+ 98 Login-IPv6-Host
0 0+ 0 0 0+ 99 Framed-IPv6-Route
0 0-1 0 0 0-1 100 Framed-IPv6-Pool4. References Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels",,, March, 1997.

Yergeau, F., "UTF-8, a transformation format of Unicode and ISO
10646",, October 1996.

Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy
Implementation in Roaming",, June 1999.

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

Rigney, C., "RADIUS Accounting",, June 2000.

Zorn, G., Mitton, D. and B. Aboba, "RADIUS Accounting
Modifications for Tunnel Protocol Support",, June
2000.

Zorn, G., Leifer, D., Rubens, A., Shriver, J., Holdrege, M.
and I. Goyret, "RADIUS Attributes for Tunnel Protocol Support",, June 2000.

Rigney, C., Willats, W. and P. Calhoun, "RADIUS Extensions",, June 2000.

Kent S. and R. Atkinson, "Security Architecture for the
Internet Protocol",, November 1998.

Alvestrand, H. and T. Narten, "Guidelines for Writing an IANA
Considerations Section in RFCs",,, October
1998.

Haskin, D. and E. Allen, "IP Version 6 over PPP",,
December 1998.

Carpenter, B. and K. Moore, "Connection of IPv6 Domains via
IPv4 Clouds",, February 2001.

Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6)
Specification",, December 1998.

Carpenter, B. and C. Jung, "Transmission of IPv6 over IPv4
Domains without Explicit Tunnels",, March 1999. Gilligan, R. and E. Nordmark, "Transition Mechanisms for IPv6
Hosts and Routers",, August 2000.

Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture",, July 1998.5. Security ConsiderationsThis document describes the use of RADIUS for the purposes of
authentication, authorization and accounting in IPv6-enabled
networks. In such networks, the RADIUS protocol may run either over
IPv4 or over IPv6. Known security vulnerabilities of the RADIUS
protocol are described in , and .

Since IPSEC is mandatory to implement for IPv6, it is expected
that running RADIUS implementations supporting IPv6 will typically
run over IPSEC. Where RADIUS is run over IPSEC and where
certificates are used for authentication, it may be desirable to
avoid management of RADIUS shared secrets, so as to leverage the
improved scalability of public key infrastructure.

Within RADIUS, a shared secret is used for hiding of attributes such
as User-Password and Tunnel-Password . In addition, the
shared secret is used in computation of the Response Authenticator
, as well as the Message-Authenticator attribute . Therefore,
in RADIUS a shared secret is used to provide confidentiality as well
as integrity protection and authentication. As a result, only use of
IPSEC ESP with a non-null transform can provide security services
sufficient to substitute for RADIUS application-layer security.
Therefore, where IPSEC AH or ESP null is used, it will typically
still be necessary to configure a RADIUS shared secret.

However, where RADIUS is run over IPSEC ESP with a non-null
transform, the secret shared between the NAS and the RADIUS server
MAY NOT be configured. In this case, a shared secret of zero length
MUST be assumed.6. IANA ConsiderationsThis document requires the assignment of six new RADIUS attribute
numbers for the following attributes:

NAS-IPv6-Address
Framed-Interface-Id
Framed-IPv6-Prefix
Login-IPv6-Host
Framed-IPv6-Route
Framed-IPv6-Pool

Seefor the registered list of numbers.7. AcknowledgmentsThe authors would like to acknowledge Jun-ichiro itojun Hagino of IIJ
Research Laboratory, Darran Potter of Cisco and Carl Rigney of Lucent
for contributions to this document.8. Authors' AddressesBernard Aboba
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052

Phone: +1 425 936 6605
Fax: +1 425 936 7329
EMail: [email protected]

Glen Zorn
Cisco Systems, Inc.
500 108th Avenue N.E., Suite 500
Bellevue, WA 98004

Phone: +1 425 471 4861
EMail: [email protected]

Dave Mitton
Circular Logic UnLtd.
733 Turnpike Street #154
North Andover, MA 01845

Phone: 978 683-1814
Email: [email protected] Copyright Statement

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Aboba, et al. Standards Track