How can I block unwanted users on mine network. I’m using the NT server with DHCP scope and have only NT workstation. I don’t want intruder on the network. What I mean here is that some coworkers bring in their Laptops with a win95 and hookup the laptop using their account. It’s easy to setup once we use the DHCP. Is there a way to block that buy defining the MAC address in a database in the DCHP scope? Or something else that as soon somebody hookup a computer it will deny it?