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Diameter (protocol)
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== History == The Diameter protocol was initially developed by Pat R. Calhoun, Glen Zorn, and Ping Pan in 1998 to provide a framework for authentication, authorization, and accounting ([[AAA (Computer security)|AAA]]) that could overcome the limitations of RADIUS. RADIUS had issues with reliability, scalability, security, and flexibility. RADIUS cannot deal effectively with remote access, IP mobility, and policy control. The Diameter protocol defines a policy protocol used by clients to perform Policy, AAA, and resource control. This allows a single server to handle policies for many services.<ref>{{cite news|access-date=30 April 2009|author=Pat R. Calhoun, Glen Zorn, and Ping Pan|date=February 2001|publisher=[[IETF]]|title=DIAMETER Framework Document|newspaper=Ietf Datatracker |url=http://tools.ietf.org/html/draft-calhoun-diameter-framework-09}}</ref> Like RADIUS, Diameter provides AAA functionality, but uses [[Transmission Control Protocol|TCP]] and [[SCTP]] instead of [[User Datagram Protocol|UDP]], therefore delegating detection and handling of communication problems to those protocols. The Diameter protocol is enhanced further by the development of the 3rd Generation Partnership Project (3GPP) [[IP Multimedia Subsystem]] (IMS). The S6a, S6b, Gx, Gy, Sy, Rx, Cx, Dh, Dx, Rf, Ro, Sh and Zh interfaces are supported by Diameter applications.<ref>{{cite web |url = https://blogs.oracle.com/naman/entry/introduction_to_diameter_protocol |title = Introduction to Diameter Protocol - What is Diameter Protocol? |publisher = [[Sun Microsystems]] |author = Naman Mehta |date = 20 March 2009 |access-date = 30 April 2009 |archive-url = https://web.archive.org/web/20110704234203/http://blogs.oracle.com/naman/entry/introduction_to_diameter_protocol |archive-date = 4 July 2011 |url-status = dead |df = dmy-all }}</ref> Through the use of extensions, the protocol was designed to be extensible to support proxies, brokers, strong security, mobile IP, network-access servers (NASREQ), accounting and resource management.
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