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Windows Server® 2008 TCP/IP Protocols and Services by Joseph Davies

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RADIUS is a simple client-server protocol that carries authentication, authorization, and accounting information between a network access server (NAS) and a centralized server. Examples of NASs include IEEE 802.11 wireless access points and servers that provide remote access connectivity to an organization’s network or the Internet.

A RADIUS client is a NAS that initiates RADIUS message exchanges for connection requests or accounting of connections. A RADIUS server receives and evaluates connection requests for authentication and authorization or stores accounting messages. A RADIUS proxy routes RADIUS connection requests ...

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