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Diameter is not directly backwards compatible but provides an upgrade path for RADIUS.The main features provided by Diameter but lacking in RADIUS are.Like RADIUS, it is intended to work in both local and roaming AAA situations.
Unlike RADIUS it includes no encryption, but can be protected by transport level security (IPSEC or TLS).
Like RADIUS, it supports stateless as well as stateful modes.
Like RADIUS, it supports application layer acknowledgment and defines failover.
Diameter is used for many different interfaces defined by the 3GPP standards, with each interface typically defining new commands and attributes.
Each application is defined by an application identifier and can add new command codes andor new mandatory AVPs ( Attribute-Value Pair ).
Adding a new optional AVP does not require a new application.
Calhoun, Glen Zorn, and Ping Pan in 1998 to provide a framework for authentication, authorization and accounting ( 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.
Cda chrysler diagnostic application softwareThe 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.
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.
Diameter Applications can extend the base protocol by adding new commands, attributes, or both.
Tubelight movie downloadThe IANA has assigned TCP and SCTP port number 3868 to Diameter, as stated in section 11.4 of RFC 6733.
Messages with the E bit set are commonly referred to as error messages.
Whether it is the request or answer is identified via the R bit in the Command Flags field of the header.
The values 256-16777213 are for permanent, standard commands allocated by IANA.