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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.
Livingston was the original author of the RADIUS standard for authentication. [8] The open source FreeRADIUS implementation that is being developed since 1999 has a syntax that is similar to the original Livingston implementation. [9] In 1998, it released the RADIUS Accounting Billing Manager software. [10]
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.
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. While at one point it was expected that Diameter was to replace RADIUS, that has not happened.
RADIUS is a standard for dedicated authentication servers. Windows 2000 Server and Windows Server 2003 include the Internet Authentication Service (IAS), an implementation of RADIUS server. IAS supports authentication for Windows-based clients, as well as for third-party clients that adhere to the RADIUS standard.
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Remote Authentication Dial In User Service (RADIUS) June 2000: RADIUS: RFC 2866 : RADIUS Accounting: June 2000: RFC 2935 : Internet Open Trading Protocol (IOTP) HTTP Supplement September 2000 Internet Open Trading Protocol: RFC 2974 : Session Announcement Protocol: October 2000: SAP: RFC 3504 : Internet Open Trading Protocol (IOTP), Version 1 ...
The name is a play on words, derived from the RADIUS protocol, which is the predecessor (a diameter is twice the radius). Diameter is not directly backward compatible but provides an upgrade path for RADIUS. The main features provided by Diameter but lacking in RADIUS are: Support for SCTP; Capability negotiation