psychov, для общего развития читаем
http://ru.wikipedia.org/wiki/RADIUS
Для углублённого -
http://www.cisco.com/en/US/docs/ios/12_ ... fra22.html
и
* RFC 2865 Remote Authentication Dial In User Service (RADIUS)
* RFC 2866 RADIUS Accounting
* RFC 2548 Microsoft Vendor-specific RADIUS Attributes
* RFC 2607 Proxy Chaining and Policy Implementation in Roaming
* RFC 2618 RADIUS Authentication Client MIB
* RFC 2619 RADIUS Authentication Server MIB
* RFC 2620 RADIUS Accounting Client MIB
* RFC 2621 RADIUS Accounting Server MIB
* RFC 2809 Implementation of L2TP Compulsory Tunneling via RADIUS
* RFC 2867 RADIUS Accounting Modifications for Tunnel Protocol Support
* RFC 2868 RADIUS Attributes for Tunnel Protocol Support
* RFC 2869 RADIUS Extensions
* RFC 2882 Network Access Servers Requirements: Extended RADIUS Practices
* RFC 3162 RADIUS and IPv6
* RFC 3575 IANA Considerations for RADIUS
* RFC 3576 Dynamic Authorization Extensions to RADIUS
* RFC 4672 RADIUS Dynamic Authorization Client MIB
* RFC 4673 RADIUS Dynamic Authorization Server MIB
* RFC 3579 RADIUS Support for EAP
* RFC 3580 IEEE 802.1X RADIUS Usage Guidelines
* RFC 4014 RADIUS Attributes Suboption for the DHCP Relay Agent Information Option