Radius is a system serving for authentication and accounting. The acronym RADIUS stands for Remote Authentication in Dial-In User Service and usually denotes the underlying protocol name.
Historically, radius servers were used as a means to authenticate the user coming from a dial-in connection, but GNU Radius is much more than an authentication system: it is an advanced, customizable and extensible system for controlling access to the network.
GNU Radius has several built-in authentication and accounting methods. When these methods are not enough, it allows administrator to implement any new method he deems convenient.
GNU Radius includes radius server program capable of serving authentication and accounting requests, and a set of accompanying programs designed to monitor the activity of the server and analyze the information it provides.
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