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Introducing IAS

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Introducing IAS

Internet Authentication Service (IAS) in Microsoft® Windows Server® 2003, Standard Edition; Windows Server 2003, Enterprise Edition; and Windows Server 2003, Datacenter Edition is the Microsoft implementation of a Remote Authentication Dial-In User Service (RADIUS) server and proxy. As a RADIUS server, IAS performs centralized connection authentication, authorization, and accounting for many types of network access, including wireless, authenticating switch, dial-up and virtual private network (VPN) remote access, and router-to-router connections. As a RADIUS proxy, IAS forwards authentication and accounting messages to other RADIUS servers. IAS supports the Internet Engineering Task Force (IETF) standards for RADIUS described in RFCs 2865 and 2866.

IAS enables the use of a heterogeneous set of wireless, switch, remote access, or VPN equipment. You can use IAS with the Routing and Remote Access service, which is available in Microsoft Windows 2000, Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; and Windows Server 2003, Datacenter Edition.

When an IAS server is a member of an Active Directory® domain, IAS uses the directory service as its user account database and is part of a single sign-on solution. The same set of credentials is used for network access control (authenticating and authorizing access to a network) and to log on to an Active Directory domain.

Internet service providers (ISPs) and organizations that maintain network access have the increased challenge of managing all types of network access from a single point of administration, regardless of the type of network access equipment used. The RADIUS standard supports this functionality in both homogeneous and heterogeneous environments. RADIUS is a client-server protocol that enables network access equipment (used as RADIUS clients) to submit authentication and accounting requests to a RADIUS server.

A RADIUS server has access to user account information and can check network access authentication credentials. If the user's credentials are authentic and the connection attempt is authorized, the RADIUS server authorizes the user's access on the basis of specified conditions and logs the network access connection in an accounting log. The use of RADIUS allows the network access user authentication, authorization, and accounting data to be collected and maintained in a central location, rather than on each access server.

With IAS, organizations can also outsource remote access infrastructure to a service provider while retaining control over user authentication, authorization, and accounting.

Different IAS configurations can be created for the following solutions:

  • Wireless access

  • Organization dial-up or virtual private network (VPN) remote access

  • Outsourced dial-up or wireless access

  • Internet access

  • Authenticated access to extranet resources for business partners

Note

  • You can configure IAS in Windows Server 2003, Standard Edition, with a maximum of 50 RADIUS clients and a maximum of 2 remote RADIUS server groups. You can define a RADIUS client using a fully qualified domain name or an IP address, but you cannot define groups of RADIUS clients by specifying an IP address range. If the fully qualified domain name of a RADIUS client resolves to multiple IP addresses, the IAS server uses the first IP address returned in the DNS query. With IAS in Windows Server 2003, Enterprise Edition, and Windows Server 2003, Datacenter Edition, you can configure an unlimited number of RADIUS clients and remote RADIUS server groups. In addition, you can configure RADIUS clients by specifying an IP address range.