RFC 2058 (rfc2058) - Page 1 of 64

Remote Authentication Dial In User Service (RADIUS)

Network Working Group                                          C. Rigney
Request for Comments: 2058                                    Livingston
Category: Standards Track                                      A. Rubens
                                                                   Merit
                                                              W. Simpson
                                                              Daydreamer
                                                              S. Willens
                                                              Livingston
                                                            January 1997


          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.

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.

Table of Contents

   1.     Introduction ..........................................    3
      1.1       Specification of Requirements ...................    4
      1.2       Terminology .....................................    4
   2.     Operation .............................................    5
      2.1       Challenge/Response ..............................    6
      2.2       Interoperation with PAP and CHAP ................    7
      2.3       Why UDP? ........................................    8
   3.     Packet Format .........................................    9
   4.     Packet Types ..........................................   12
      4.1       Access-Request ..................................   12
      4.2       Access-Accept ...................................   14
      4.3       Access-Reject ...................................   15
      4.4       Access-Challenge ................................   16
   5.     Attributes ............................................   17
      5.1       User-Name .......................................   20
      5.2       User-Password ...................................   21
      5.3       CHAP-Password ...................................   22
      5.4       NAS-IP-Address ..................................   23



Rigney, et. al.              Informational