We want to add a DC and force a group of machines in a site to authenticate to this DC. We have all XP machines authenticating to 2003 server DC's. I know there is no way to do it 100% but can I build a site and add those machines(IP's) to that site. Then add the DC I just built to the "servers" section in Sites and Services? This will atleast force most of the authentication to this DC? We want to reduce the WAN traffic ,since we have a network that spans across our state.