| Feature | RADIUS | Diameter |
| Transport Methods | Unreliable | Reliable |
| Communication Ports | 1812 & 1813 | 3868 (Base Protocol) |
| Security | Low (Hop-to-hop security only) | High (Hop-to-hop & End-to-end security) |
| Discovering Node Capabilities | Not supported | Supported |
| Discovering other peer nodes in a network | Not supported | Supported |
| Vendor Specific Messages | Support present only for Vendor Specific Attributes | Support present only for Vendor Specific Attributes and Vendor Specific Messages |
| Server Initiated Messages | Not supported (Can be achieved using CoA/Disconnect extensions) | Supported |
| Maximum size of attributes | 255 bytes | 16MB |
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