Remote Access Dial in User Service (RADIUS)

The most widely used standard for communication between the authenticator and the authentication server, Remote Access Dial In User Service (RADIUS), is an IETF standard that defines the functions of the authentication server and the protocols to access those functions. Remote Access Dial In User Service (RADIUS) is a client/server User Datagram Protocol (UDP) application that runs over IP.

The authentication server is the Remote Access Dial In User Service (RADIUS) server, and the authenticator is the Remote Access Dial In User Service (RADIUS) client. In addition to authentication, Remote Access Dial In User Service (RADIUS) supports authorization and accounting functions, such as measuring session volume and duration that can be used for charging and billing purposes. The authentication, authorization, and accounting functions are collectively referred to as AAA functions. Numerous extensions to Remote Access Dial In User Service (RADIUS) have been defined to accommodate a variety of needs, including supporting EAP. (Wimax Forum, 2007)

Remote Access Dial In User Service (RADIUS), however, does have a number of deficiencies that cannot be easily overcome by modifications. Recognizing this, the IETF has developed a new standard for AAA functions: DIAMETER. Although not backward compatible with Remote Access Dial In User Service (RADIUS), DIAMETER does provide an upgrade path to it. DIAMETER has greater reliability, security, and roaming support than Remote Access Dial In User Service (RADIUS) does. (Wimax Forum, 2007)

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