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When a server running NPS is a member of an Active Directory Domain Services (AD DS) domain, NPS 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 AD DS domain. [3]
In Windows Server 2008, Network Policy Server (NPS) replaces the Internet Authentication Service (IAS). NPS performs all of the functions of IAS in Windows Server 2003 for VPN and 802.1X-based wireless and wired connections and performs health evaluation and the granting of either unlimited or limited access for Network Access Protection clients.
RadSec is a protocol for transporting RADIUS datagrams over TCP and TLS. The RADIUS protocol is a widely deployed authentication and authorization protocol. The supplementary RADIUS Accounting specification [1] also provides accounting mechanisms, thus delivering a full AAA protocol solution. However, RADIUS has two substantial shortcomings.
RADIUS Accounting Flow. Accounting is described in RFC 2866. When network access is granted to the user by the NAS, an Accounting Start (a RADIUS Accounting Request packet containing an Acct-Status-Type attribute with the value "start") is sent by the NAS to the RADIUS server to signal the start of the user's network access. "Start" records ...
Authentication requests and accounting information are forwarded by the V-AAA to the H-AAA, either directly or through a B-AAA. Current AAA servers communicate using the RADIUS protocol. As such, TIA specifications refer to AAA servers as RADIUS servers. While at one point it was expected that Diameter was to replace RADIUS, that has not happened.
In contrast, RADIUS offers minimal functionality for administrator authentication and command authorization, while offering strong support (and is widely used) for end-user authentication, authorization, and accounting. As such, the two protocols have little overlap in functionality or in common usage.
The Diameter protocol was initially developed by Pat R. Calhoun, Glen Zorn, and Ping Pan in 1998 to provide a framework for authentication, authorization, and accounting that could overcome the limitations of RADIUS. RADIUS had issues with reliability, scalability, security, and flexibility.
The above translates into different implementations for different uses. Here are some examples. An Internet service provider which provides network access via common modem or modem-like devices (be it PSTN, DSL, cable or GPRS/UMTS) can have one or more NAS (network access server) devices which accept PPP, PPPoE or PPTP connections, checking credentials and recording accounting data via back ...