Connecting to Windows server running Radius from a RH Linux

I have successfully installed FreeRadius on my RH Linux box and I am trying to figure out how I can connect to the radius server which is running on a W2k server. I have add my RH Linux box as a client on the server I have the key as well. My question is how do I configure my Linux box to talk to the Radius server? I see a lot of docs on client and server setup, but I am not able to find a doc if I have a Radius server running on W2k, what steps I need to go have my RH Linux box talk to the Radius Server user authentication. FYI, Radius server is tied into Active Directory (AD) for authentication and other services. Thanks.