Comparison With RADIUS
The name is a pun on the RADIUS protocol, which is the predecessor (a diameter is twice the radius). Diameter is not directly backwards compatible but provides an upgrade path for RADIUS. The main differences are the following:
- Reliable transport protocols (TCP or SCTP, not UDP)
- The IETF is in the process of standardizing TCP Transport for RADIUS
- Network or transport layer security (IPsec or TLS)
- The IETF is in the process of standardizing Transport Layer Security for RADIUS
- Transition support for RADIUS, although Diameter is not fully compatible with RADIUS
- Larger address space for attribute-value pairs (AVPs) and identifiers (32 bits instead of 8 bits)
- Client–server protocol, with exception of supporting some server-initiated messages as well
- Both stateful and stateless models can be used
- Dynamic discovery of peers (using DNS SRV and NAPTR)
- Capability negotiation
- Supports application layer acknowledgements, defines failover methods and state machines (RFC 3539)
- Error notification
- Better roaming support
- More easily extended; new commands and attributes can be defined
- Aligned on 32-bit boundaries
- Basic support for user-sessions and accounting
Read more about this topic: Diameter (protocol)
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