Network Access Server Requirements Next Generation (NASREQNG) NAS Model

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.