A friend asked me the following question which I coudn't answer so I thought I would post here.
His organisation began experiencing major performance issues with Outlook once the DC/GC was moved out of the subnet all their PC's are in to another subnet (on the same GB LAN to be sure). Performance was fine when the DC/GC was on the same subnet.
They have been told the problem is heavy traffic to the GC is causing the problem and that the way to alleviate that is to install another DC on the same subnet as their PC's and the problem will go away.
They are also told that Global Catalogue lookup is done by broadcast, therefore, it cannot cross routers/subnets. That seems strange to me since if the GC is in a different subnet, how are the Outlook clients able to look it up?
Any folks have any ideas on this?
Thanks