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Evolution of AAA Protocols: RADIUS to DIAMETER

Learn the history of RADIUS and DIAMETER protocols for authentication, authorization, and accounting services, including how DIAMETER enhances support for roaming users and new QoS capabilities.

petra-vasquez
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Evolution of AAA Protocols: RADIUS to DIAMETER

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  1. History • Since created in 1995, RADIUS has been used to provide authentication, authorization and generate accounting information for dial-in users. • However, it does not support roaming users efficiently, and is not designed to support emerging QoS (RSVP, IntServ, DiffServ) services. • In March 1998, the IESG decided to close the RADIUS WG to open the way for a more flexible protocol for AAA services. • In August 1998, a new BOF is created to design a new AAA protocol.

  2. DIAMETER • Designed by Pat Calhoun in 1996, it provides AAA for roaming users. • Today, DIAMETER can also provide policy support for VPN (Virtual Private Service), Voice over IP, Fax over IP, Mobile IP, and resource management (or Bandwidth Broker). • DIAMETER protocol consists of two potions: • Base Protocol: provide secure communication among DIAMETER entities, feature discovery, and version negotiation. • Extensions: Build on top of the base protocol to provide specific services.

  3. Communications: Peer-to-peer: Client-Server: DIAMETER Network Architecture S2 S1 Servers: S1, S2 Clients: C1, C2, C3, C4 C1 C3 C2 C4

  4. SIP Proxy Callee Regional ISP B Regional ISP A User Accounting (DIAMETER Extension) Policy Server B Policy Server A Resource Management Real-time Data IP Telephony Service Network Transit ISPs SIP Proxy Caller Router Router Inter-carrier Accounting

  5. DIAMETER Server DIAMETER Client SIP Client SIP Proxy Server DIAMETER / SIP Extension DIAMETER Messages SIP Messages SIP Messages

  6. … Mechanism Caller Proxy Policy Server Policy Server Callee Proxy Allow? Yes SIP INVITE Accept? Yes SIP 200 (Success) Register SIP ACK Register SIP BYE Release Release

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