Introduction to RADIUS
Remote Authentication Dial-In User Service (RADIUS) is a protocol used for communication between the network access server (NAS) and the AAA server. RADIUS supports all three aspects of AAA: authentication, authorization, and accounting.
RFC 2865 covers the RADIUS protocol. As described in that RFC, key features of RADIUS are as follows:
Client/Server Model— A Network Access Server (NAS) operates as a client of RADIUS. The client is responsible for passing user information to designated RADIUS servers, and then acting on the response which is returned.
RADIUS servers are responsible for receiving user connection requests, authenticating the user, and then returning all configuration information necessary for the client to ...
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