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CCIE Security v4.0 Quick Reference, Third Edition by Umesh Lakshman, Lancy Lobo

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Chapter 2. Security Protocols

RADIUS

RADIUS is a distributed client/server system that secures networks against unauthorized access. In the Cisco implementation, RADIUS clients run on Cisco routers and send authentication requests to a central RADIUS server that contains all user authentication and network service access information. RADIUS uses UDP for the underlying transport protocol and is considered a connectionless service. The retransmission and reliability are handled by the end points.

It is a fully open protocol, distributed in source code format that can be modified to work with any security system currently available on the market. RFC 2865 highlights all the details of the RADIUS protocol.

RADIUS has been implemented in various ...

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