Network Working Group                                           B. Aboba
INTERNET-DRAFT                                                 Microsoft
Category: Standards Track
7 February 2003
Updates: RFC 2865

IANA Considerations for Remote Authentication Dial In User Service (RADIUS)

This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC 2026.

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Copyright Notice

Copyright (C) The Internet Society (2003).  All Rights Reserved.


This document describes the IANA considerations for the Remote
Authentication Dial In User Service (RADIUS).

This document updates RFC 2865.

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1.  Introduction

This document provides guidance to the Internet Assigned Numbers
Authority (IANA) regarding registration of values related to the Remote
Authentication Dial In User Service (RADIUS), defined in [RFC2865], in
accordance with BCP 26, [RFC2434].

1.1.  Specification of Requirements

In this document, several words are used to signify the requirements of
the specification.  These words are often capitalized.  The key words
NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this document are to be
interpreted as described in [RFC2119].

1.2.  Terminology

The following terms are used here with the meanings defined in BCP 26:
"name space", "assigned value", "registration".

The following policies are used here with the meanings defined in BCP
26: "Private Use", "First Come First Served", "Expert Review",
"Specification Required", "IETF Consensus", "Standards Action".

2.  IANA Considerations

There are three name spaces in RADIUS that require registration: Packet
Type Codes, Attribute Types, and Attribute Values (for certain

RADIUS is not intended as a general-purpose protocol, and allocations
SHOULD NOT be made for purposes unrelated to Authentication,
Authorization or Accounting.

2.1.  Recommended Registration Policies

For registration requests where a Designated Expert should be consulted,
the responsible IESG area director should appoint the Designated Expert.
Where a specification is required, this MUST be an Internet-Draft or
RFC.  For Designated Expert with Specification Required, the request is
posted to the AAA WG mailing list (or, if it has been disbanded, a
successor designated by the Area Director) for comment and review, and
MUST include a an Internet-Draft or RFC. Before a period of 30 days has
passed, The Designated Expert will either approve or deny the
registration request and publish a notice of the decision to the AAA WG
mailing list or its successor.  A denial notice must be justified by an
explanation and, in the cases where it is possible, concrete suggestions
on how the request can be modified so as to become acceptable.

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Packet Type Codes have a range from 1 to 254, of which 1-5,11-13,40-45
have been allocated.  Because a new Packet Type has considerable impact
on interoperability, a new Packet Type Code requires Standards Action,
and should be allocated starting at 46. It is recommended that packet
Type Codes 14-39 be used only after all the others are exhausted.  A
list of allocated RADIUS Type Codes is given below:

1    Access-Request               [RFC2865]
2    Access-Accept                [RFC2865]
3    Access-Reject                [RFC2865]
4    Accounting-Request           [RFC2866]
5    Accounting-Response          [RFC2866]
6-10   (unassigned)
11   Access-Challenge
12   Status-Server (experimental)
13   Status-Client (experimental)
40   Disconnect-Request           [DynAuth]
41   Disconnect-ACK               [DynAuth]
42   Disconnect-NAK               [DynAuth]
43   CoF-Request                  [DynAuth]
44   CoF-ACK                      [DynAuth]
45   CoF-NAK                      [DynAuth]
255  Reserved

Attribute Types have a range from 1 to 255, and are the scarcest
resource in RADIUS, thus must be allocated with care.  Attributes
1-53,55,60-88,90-91,94-100 have been allocated, with 17 and 21 available
for re-use.  Attributes 17, 21, 54, 56-59, 89, 101-191 may be allocated
by IETF Consensus.  It is recommended that attributes 17 and 21 be used
only after all others are exhausted.

Note that RADIUS defines a mechanism for Vendor-Specific extensions
(Attribute 26) and the use of that should be encouraged instead of
allocation of global attribute types, for functions specific only to one
vendor's implementation of RADIUS, where no interoperability is deemed

As stated in the "Attributes" section above:

  "[Attribute Type] Values 192-223 are reserved for experimental
  use, values 224-240 are reserved for implementation-specific use,
  and values 241-255 are reserved and should not be used."

Therefore Attribute values 192-240 are considered Private Use, and
values 241-255 require Standards Action.

Certain attributes (for example, NAS-Port-Type) in RADIUS define a list
of values to correspond with various meanings.  There can be 4 billion

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(2^32) values for each attribute. Additional values can be allocated by
Designated Expert with Specification Required.  The exception to this
policy is the Service-Type attribute (6), whose values define new modes
of operation for RADIUS.  Values 1-14 of the Service-Type attribute have
been allocated. Allocation of new Service-Type values are by IETF

3.  Normative references

[RFC2119]      Bradner, S., "Key words for use in RFCs to Indicate
               Requirement Levels", RFC 2119, March 1997.

[RFC2434]      Alvestrand, H. and Narten, T., "Guidelines for Writing an
               IANA Considerations Section in RFCs", BCP 26, RFC 2434,
               October 1998.

[RFC2865]      Rigney, C., Rubens, A., Simpson, W., Willens, S.,
               "Remote Authentication Dial In User Service (RADIUS)",
               RFC 2865, June 2000.

3.1.  Informative references

[RFC2866]      Rigney, C., "RADIUS Accounting", RFC 2866, June 2000.

[RFC2867]      Zorn, G., Mitton, D., Aboba, B., "RADIUS Accounting
               Modifications for Tunnel Protocol Support", RFC 2867,
               June 2000.

[RFC2868]      Zorn, G., Leifer, D., Rubens, A., Shriver, J., Holdrege,
               M., Goyret, I., "RADIUS Attributes for Tunnel Protocol
               Support", RFC 2868, June 2000.

[RFC2869]      Rigney, C., Willats, W., Calhoun, P., "RADIUS
               Extensions", RFC 2869, June 2000.

[RFC3162]      Aboba, B., Zorn, G., Mitton, D.,"RADIUS and IPv6", RFC
               3162, August 2001.

[DynAuth]      Chiba, M., et al., "Dynamic Authorization Extensions to
               Remote Authentication Dial-In User Service (RADIUS)",
               Internet draft (work in progress), draft-chiba-radius-
               dynamic-authorization-06.txt, July 2003.

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Thanks to Allison Mankin of Lucent Bell Labs for discussions relating to
this document.

Authors' Addresses

Bernard Aboba
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052

Phone: +1 425 706 6605
Fax:   +1 425 936 7329

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Expiration Date

This memo is filed as <draft-aboba-radius-iana-00.txt>,  and  expires
August 19, 2003.

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