Internet DRAFT - draft-aboba-radius-iana


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

                     IANA Considerations for 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].  It also reserves Packet Type Codes
that are or have been in use on the Internet.

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", "IESG Approval", "IETF Consensus", "Standards

2.  IANA Considerations

There are three name spaces in RADIUS that require registration: Packet
Type Codes, Attribute Types, and Attribute Values (for certain
Attributes).  This draft creates no new IANA registries, since a RADIUS
registry was created by [RFC2865].

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.
The intention is that any allocation will be accompanied by a published
RFC.  But in order to allow for the allocation of values prior to the
RFC being approved for publication, the Designated Expert can approve
allocations once it seems clear that an RFC will be published.  The
Designated expert will post a request to the AAA WG mailing list (or a
successor designated by the Area Director) for comment and review,
including an Internet-Draft.  Before a period of 30 days has passed, The

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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, as well as informing IANA.  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

Packet Type Codes have a range from 1 to 253.  RADIUS Type Codes 1-5 and
11-13 were allocated in [RFC2865], while Type Codes 40-45, 250-253 are
allocated by this document.  Type Codes 250-253 are allocated for
Experimental Uses, and 254-255 are reserved.  Packet Type Codes 6-10,
12-13, 21-34, 50-51 have no meaning defined by an IETF RFC, but are
reserved until a specification is provided for them.  This is being done
to avoid interoperability problems with software that implements non-
standard RADIUS extensions that are or have been in use on the Internet.
Because a new Packet Type has considerable impact on interoperability, a
new Packet Type Code requires IESG Approval.  The intention is that any
allocation will be accompanied by a published RFC.  Type Codes 52-249
should be allocated first; when these are exhausted, Type Codes 14-20,
35-39, 46-49 may be allocated.  For a list of Type Codes, see Appendix

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 noted in [RFC2865]:

   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 Type 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
(2^32) values for each attribute. Additional values can be allocated by
Designated Expert.  The exception to this policy is the Service-Type

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attribute (6), whose values define new modes of operation for RADIUS.
Values 1-16 of the Service-Type attribute have been allocated.
Allocation of new Service-Type values are by IETF Consensus.  The
intention is that any allocation will be accompanied by a published RFC.

3.  Normative references

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

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

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

4.  Informative references

[RFC2607]      Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy
               Implementation in Roaming", RFC 2607, June 1999.

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

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

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

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

[RFC2869bis]   Aboba, B. and P. Calhoun, "RADIUS Support for Extensible
               Authentication Protocol (EAP)", draft-aboba-radius-
               rfc2869bis-20.txt, Internet draft (work in progress),
               April 2003.

[RFC2882]      Mitton, D., "Network Access Servers Requirements:
               Extended RADIUS Practices", RFC 2882, July 2000.

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

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[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-18.txt, April 2003.

5.  Security Considerations

The security considerations detailed in [RFC2434] are generally
applicable to this document.  Security considerations relating to the
RADIUS protocol are discussed in [RFC2607], [RFC2865], [RFC3162],
[DynAuth], and [RFC2869bis].

Appendix A - RADIUS Packet Types

A list of RADIUS Packet Type Codes is given below. This document
instructs IANA to list them in the registry of Packet Type Codes.  Note
that Type Codes 40-45, which are defined in [DynAuth] are being formally
allocated here.  Codes 40-45 were listed in [RFC2882] and have been
implemented and used.  Given their widespread current usage, these
assignments are not reclaimable in practice.

#        Message                      Reference
----     -------------------------    ---------
1        Access-Request               [RFC2865]
2        Access-Accept                [RFC2865]
3        Access-Reject                [RFC2865]
4        Accounting-Request           [RFC2865]
5        Accounting-Response          [RFC2865]
6        Accounting-Status            [RFC2882]
         (now Interim Accounting)
7        Password-Request             [RFC2882]
8        Password-Ack                 [RFC2882]
9        Password-Reject              [RFC2882]
10       Accounting-Message           [RFC2882]
11       Access-Challenge             [RFC2865]
12       Status-Server (experimental) [RFC2865]
13       Status-Client (experimental) [RFC2865]
21       Resource-Free-Request        [RFC2882]
22       Resource-Free-Response       [RFC2882]
23       Resource-Query-Request       [RFC2882]
24       Resource-Query-Response      [RFC2882]
25       Alternate-Resource-
         Reclaim-Request              [RFC2882]
26       NAS-Reboot-Request           [RFC2882]
27       NAS-Reboot-Response          [RFC2882]
28       Reserved
29       Next-Passcode                [RFC2882]

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#        Message                      Reference
----     -------------------------    ---------
30       New-Pin                      [RFC2882]
31       Terminate-Session            [RFC2882]
32       Password-Expired             [RFC2882]
33       Event-Request                [RFC2882]
34       Event-Response               [RFC2882]
40       Disconnect-Request           [DynAuth]
41       Disconnect-ACK               [DynAuth]
42       Disconnect-NAK               [DynAuth]
43       CoA-Request                  [DynAuth]
44       CoA-ACK                      [DynAuth]
45       CoA-NAK                      [DynAuth]
50       IP-Address-Allocate          [RFC2882]
51       IP-Address-Release           [RFC2882]
250-253  Experimental Use
254      Reserved
255      Reserved                     [RFC2865]


Thanks to Ignacio Goyret of Lucent, Allison Mankin of Lucent Bell Labs,
Thomas Narten of IBM, Glen Zorn and Harald Alvestrand of Cisco 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-07.txt>,  and  expires
November 19, 2003.

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