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Chapter 8.5. Remote Access Service (RAS) > Internet Authentication Service

Internet Authentication Service

Windows NT 4.0 Option Pack was Microsoft's first RADIUS implementation, compliant with the specifications of RFC 2138 and 2139. Now, Windows 2000 ships with both a Remote Authentication Dial-In User Service (RADIUS) client and a RADIUS server called Internet Authentication Service, or IAS.

RAS can behave like a RADIUS client and provide information to a RADIUS server that is used for authentication and accounting purposes. The RADIUS server can be either IAS or an external third-party server. Also, multiple servers can be configured to provide fault-tolerance. IAS as a RADIUS server validates client requests based on authentication and authorization, plus it provides accounting for users who connect using dial-up or VPN connections.


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