RFC 2881 (rfc2881) - Page 1 of 20
Network Access Server Requirements Next Generation (NASREQNG) NAS Model
Alternative Format: Original Text Document
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