RFC 2139 (rfc2139) - Page 2 of 25

RADIUS Accounting

RFC 2139                   RADIUS Accounting                  April 1997


      5.9       Acct-Output-Packets .............................   17
      5.10      Acct-Terminate-Cause ............................   18
      5.11      Acct-Multi-Session-Id ...........................   20
      5.12      Acct-Link-Count .................................   21
      5.13      Table of Attributes .............................   22
   Security Considerations ......................................   24
   References ...................................................   24
   Acknowledgements .............................................   24
   Chair's Address ..............................................   24
   Author's Address .............................................   25

1.  Introduction

   Managing dispersed serial line and modem pools for large numbers of
   users can create the need for significant administrative support.
   Since modem pools are by definition a link to the outside world, they
   require careful attention to security, authorization and accounting.
   This can be best achieved by managing a single "database" of users,
   which allows for authentication (verifying user name and password) as
   well as configuration information detailing the type of service to
   deliver to the user (for example, SLIP, PPP, telnet, rlogin).

   The RADIUS (Remote Authentication Dial In User Service) document [4]
   specifies the RADIUS protocol used for Authentication and
   Authorization.  This memo extends the use of the RADIUS protocol to
   cover delivery of accounting information from the Network Access
   Server (NAS) to a RADIUS accounting server.

   Key features of RADIUS Accounting are:

      Client/Server Model

         A Network Access Server (NAS) operates as a client of the
         RADIUS accounting server.  The client is responsible for
         passing user accounting information to a designated RADIUS
         accounting server.

         The RADIUS accounting server is responsible for receiving the
         accounting request and returning a response to the client
         indicating that it has successfully received the request.

         The RADIUS accounting server can act as a proxy client to other
         kinds of accounting servers.








Rigney                       Informational