Add RADIUS server capability to Windows 2000 Server

The Internet Authentication Service (IAS) enables Windows 2000 Server to function as a RADIUS server. In this Windows 2000 Server tip, Jim Boyce examines the benefits offered by IAS and tells you how to install it on Windows 2000.

Remote Authentication Dial-In User Service (RADIUS) is a standard protocol for the authentication and accounting of remote access users. Many remote access vendors use RADIUS as the authentication method of choice for their dial-up, VPN, and other remote access equipment.

Included in Windows 2000 Server, Internet Authentication Service (IAS) is the Microsoft implementation of a RADIUS server, and it enables the Windows 2000 Server to function as a RADIUS server. IAS' RADIUS capability offers several benefits. Let's look at a few of these advantages:

  • IAS centralizes and consolidates authentication: You can maintain a single set of user accounts in Active Directory and use those accounts to authenticate remote users that access the network through dial-up equipment or VPN connections to remote access servers.
  • It allows you to outsource remote access: You can outsource remote access to your ISP and use IAS to authenticate and log access. Outsourcing relieves your organization of the cost of the remote access hardware and maintenance associated with managing the remote access equipment.
  • It centralizes authentication management: A single IAS server (or a small group of servers) can handle remote access authentication and accounting for multiple remote access points, simplifying remote access administration in the process.

Installing IAS on your Windows 2000 Server is an easy process. Follow these steps:

    1. Go to Start | Settings | Control Panel.
    2. Double-click the Add/Remove Programs applet.
    3. Select Add/Remove Windows Components.
    4. In the Components list, select Networking Services, and click Details.
    5. Select the Internet Authentication Service check box, click OK, and click Next to start the installation.

    After you've installed IAS, go to Start | Programs | Administrative Tools | Internet Authentication Service to open the IAS console. From here, you can configure authentication and accounting ports, monitor users, and perform other RADIUS administration tasks.

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