Remote Authentication Dial-In User Service (RADIUS) server
RADIUS is an AAA (authentication, authorization and accounting) protocol for managing client access to network services, and is described by RFCs 2865 to 2869. This version of the RADIUS server is from Lucent Technologies Inc., formerly known as Livingston Enterprises Inc.
Some Internet Service Providers (ISPs) require a username and password to be given on connection. Before access to the network is granted, this information is passed to a Network Access Server (NAS) device over the link-layer protocol and then to a RADIUS server over the RADIUS protocol. The RADIUS server checks that the information is correct using authentication schemes like PAP, CHAP or EAP. If accepted, the server will then authorize access to the ISP's system and select an IP address, L2TP parameters, etc.
RADIUS is also commonly used for accounting purposes so that the users can be billed accordingly.
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