Protocols and standards
RFC 2865, Remote Authentication Dial In User Service (RADIUS)
RFC 2866, RADIUS Accounting
RFC 2867, RADIUS Accounting Modifications for Tunnel Protocol Support
RFC 2868, RADIUS Attributes for Tunnel Protocol Support
RFC 2869, RADIUS Extensions
RFC 1492, An Access Control Protocol, Sometimes Called TACACS
RFC 1777, Lightweight Directory Access Protocol
RFC 2251, Lightweight Directory Access Protocol (v3)