RADIUS Protocol

Remote Authentication Dial-In User Service (RADIUS) is an industry standard for providing authorization, identification, authentication, and accounting services for distributed dial-up/remote access networking. A RADIUS client, typically a dial-up server used by an ISP, sends user information to a RADIUS server. The RADIUS server validates the RADIUS client request.

For more information about the RADIUS protocol, see RFCs 2138 and 2139.