RFC 2881 (rfc2881) - Page 1 of 20

Network Access Server Requirements Next Generation (NASREQNG) NAS Model

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Network Working Group                                            D. Mitton
Request for Comments: 2881                                 Nortel Networks
Category: Informational                                         M. Beadles
                                                           SmartPipes Inc.
                                                                 July 2000


     Network Access Server Requirements Next Generation (NASREQNG)
                               NAS Model

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document describes the terminology and gives a model of typical
   Network Access Server (NAS).  The purpose of this effort is to set
   the reference space for describing and evaluating NAS service
   protocols, such as RADIUS (RFCs 2865, 2866) [1], [2] and follow-on
   efforts like AAA Working Group, and the Diameter protocol [3].  These
   are protocols for carrying user service information for
   authentication, authorization, accounting, and auditing, between a
   Network Access Server which desires to authenticate its incoming
   calls and a shared authentication server.

Table of Contents

   1. INTRODUCTION...................................................2
    1.1 Scope of this Document ......................................2
    1.2 Specific Terminology ........................................3
   2. NETWORK ACCESS SYSTEM EQUIPMENT ASSUMPTIONS....................3
   3. NAS SERVICES...................................................4
   4. AUTHENTICATION, AUTHORIZATION AND ACCOUNTING (AAA) SERVERS.....5
   5. TYPICAL NAS OPERATION SEQUENCE:................................5
    5.1 Characteristics of Systems and Sessions: ....................6
    5.2 Separation of NAS and AAA server functions ..................7
    5.3 Network Management and Administrative features ..............7
   6. AUTHENTICATION METHODS.........................................8
   7. SESSION AUTHORIZATION INFORMATION..............................8
   8. IP NETWORK INTERACTION.........................................9
   9. A NAS MODEL...................................................10



Mitton & Beadles             Informational
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