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RADIUS is an AAA (authentication, authorization, and accounting) protocol that manages network access. RADIUS uses two types of packets to manage the full AAA process: Access-Request, which manages authentication and authorization; and Accounting-Request, which manages accounting.
The V-AAA in the serving network communicates with the H-AAA in a roamer's home network. Authentication requests and accounting information are forwarded by the V-AAA to the H-AAA, either directly or through a B-AAA. Current AAA servers communicate using the RADIUS protocol. As such, TIA specifications refer to AAA servers as RADIUS servers ...
Remote Authentication Dial-In User Service (RADIUS) is a full AAA protocol commonly used by ISPs. Credentials are mostly username-password combination based, and it uses NAS and UDP protocol for transport. [7]
Also: Like RADIUS, it is intended to work in both local and roaming AAA situations. It uses TCP or SCTP, unlike RADIUS which uses UDP. Unlike RADIUS it includes no encryption but can be protected by transport-level security (IPSEC or TLS). The base size of the AV identifier is 32 bit unlike RADIUS which uses 8 bit as the base AV identifier size.
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RadSec is a protocol for transporting RADIUS datagrams over TCP and TLS. The RADIUS protocol is a widely deployed authentication and authorization protocol. The supplementary RADIUS Accounting specification [1] also provides accounting mechanisms, thus delivering a full AAA protocol solution. However, RADIUS has two substantial shortcomings.
Remote Authentication Dial In User Service (RADIUS) is an AAA (authentication, authorization and accounting) protocol used for remote network access. RADIUS, developed in 1991, was originally proprietary but then published in 1997 under ISOC documents RFC 2138 and RFC 2139.
TACACS is defined in RFC 1492, and uses (either TCP or UDP) port 49 by default.TACACS allows a client to accept a username and password and send a query to a TACACS authentication server, sometimes called a TACACS daemon.