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Remote Authentication Dial In User Service (RADIUS)
RFC 2865

Document type: RFC - Draft Standard (June 2000; Errata)
Obsoletes RFC 2138
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Document shepherd: No shepherd assigned

IESG State: RFC 2865 (Draft Standard)
Responsible AD: (None)
Send notices to: No addresses provided

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 2000

Table 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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