Network Working Group C. Rigney
Request for Comments: 2865 S. Willens
Obsoletes: 2138 Livingston
Category: Standards Track A. Rubens
Merit
W. Simpson
Daydreamer
June 2000
Remote Authentication Dial In User Service (RADIUS)
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 Internet Society (2000). All Rights Reserved.
IESG Note:
This protocol is widely implemented and used. Experience has shown
that it can suffer degraded performance and lost data when used in
large scale systems, in part because it does not include provisions
for congestion control. Readers of this document may find it
beneficial to track the progress of the IETF's AAA working group,
which may develop a successor protocol that better addresses the
scaling and congestion control issues.
Abstract
This document describes a protocol for carrying authentication,
authorization, and configuration information between a Network Access
Server which desires to authenticate its links and a shared
Authentication Server.
Implementation Note
This memo documents the RADIUS protocol. The early deployment of
RADIUS was done using UDP port number 1645, which conflicts with the
"datametrics" service. The officially assigned port number for
RADIUS is 1812.
Rigney, et al. Standards Track [Page 1]RFC 2865 RADIUS June 2000Table of Contents
1. Introduction .......................................... 3
1.1 Specification of Requirements ................... 4
1.2 Terminology ..................................... 5
2. Operation ............................................. 5
2.1 Challenge/Response .............................. 7
2.2 Interoperation with PAP and CHAP ................ 8
2.3 Proxy ........................................... 8
2.4 Why UDP? ........................................ 11
2.5 Retransmission Hints ............................ 12
2.6 Keep-Alives Considered Harmful .................. 13
3. Packet Format ......................................... 13
4. Packet Types .......................................... 17
4.1 Access-Request .................................. 17
4.2 Access-Accept ................................... 18
4.3 Access-Reject ................................... 20
4.4 Access-Challenge ................................ 21
5. Attributes ............................................ 22
5.1 User-Name ....................................... 26
5.2 User-Password ................................... 27
5.3 CHAP-Password ................................... 28
5.4 NAS-IP-Address .................................. 29
5.5 NAS-Port ........................................ 30
5.6 Service-Type .................................... 31
5.7 Framed-Protocol ................................. 33
5.8 Framed-IP-Address ............................... 34
5.9 Framed-IP-Netmask ............................... 34
5.10 Framed-Routing .................................. 35
5.11 Filter-Id ....................................... 36
5.12 Framed-MTU ...................................... 37
5.13 Framed-Compression .............................. 37
5.14 Login-IP-Host ................................... 38
5.15 Login-Service ................................... 39
5.16 Login-TCP-Port .................................. 40
5.17 (unassigned) .................................... 41
5.18 Reply-Message ................................... 41
5.19 Callback-Number ................................. 42
5.20 Callback-Id ..................................... 42
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