EnterpriseNetworkingPlanet: FreeRADIUS and Linux Secure Your WLAN

"The RADIUS (Remote Authentication Dial-In User Service) protocol has long been a standard authentication, authorization and accounting protocol for Internet service providers and businesses. It determines who you are, what you're allowed to do, and records how long you did it for. It works for more than just dialup users--it also works for DSL, cable, and wireless users.

"Anytime you study RADIUS, you read about 'AAA,' the authentication/authorization/accounting functions. Sometimes it is even called RADIUS-AAA. (And now you know it's not about a twelve-step program or automobile club.) The accounting part can be used for billing or statistical analysis. RADIUS can use text files of users for authentication, or hook into Linux/Unix password files, NIS (Network Information Service), LDAP (Lightweight Directory Access Protocol) directories, MySQL and other databases..."

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