4.16.1. The RADIUS protocol

Remote Authentication Dial In User Service (RADIUS) is a client-server protocol for user authentication between the Network Access Server (NAS) and the authenticator server. The protocol has three participants:

  • The user requesting network access the service (e.g.: PPP, PLIP etc.).

  • The access point (modem pools or NAS servers), which delivers the service. The access point acts as the client in the protocol.

  • The server which authenticates the user.

The RadiusProxy is installed between the server and client (i.e. the access point).