I have wireless network.User are connected using avaya wireless routers and APs.
First computer ( W2000 server) runs ISA server and act as internet gateway. It uses one public IP address and his local network IP address is 192.168.0.1 (255.255.255.0)
Second computer (W2000 adv server) is domain controler and DHCP server. IP address of this computer is 192.168.0.2
DHCP server gives users addresses from 192.168.0.100 throu 192.168.0.254.
Problems occur when some user enter manually IP address of one of my servers or ip address of some other user.
How disable user to make situation like this or how to disable user to see other computers in network neigborhood. It is enough user can authenticate on my domain controler, and get connection on internet using my ISA server.