Client/server protocol and software that enables remote access servers to communicate with a central server to authenticate dial-in users and authorize their access to the requested system or service. RADIUS allows a company to maintain user profiles in a central database that all remote servers can share.
A centralized network-authentication standard that includes authentication, authorization and accounting features. A RADIUS server may also include the ability to pass-through authentication to proxy servers.
A security authentication protocol based on clients and servers and widely used by Internet service providers (ISPs) on remote servers in non-Windows-brand operating systems. RADIUS is the most popular means of authenticating and authorizing dial-up and tunneled network users today. See also: authentication; tunnel