1 Introduction

The Remote Access Dial In User Service (RADIUS) Protocol (as specified in [RFC2865]) provides authentication, authorization, and accounting (AAA) of endpoints in scenarios such as wireless networking, dial-up networking, and virtual private networking (VPN).

RADIUS is an extensible protocol that allows vendors to provide specialized behavior through the use of vendor-specific attributes (VSAs) ([RFC2865] section 5.26).

Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.