I just inherited a network consist of w2k servers, with 150+ users running w2k-Pro and a firewall. All these workstation had static ip address, which allow the firewall to control which machine can get internet access. As you can see 150+ is not much, but the company is growing and maintaince the static ip scheme in the long run is kinda hectic. I'm consider install an ISA, but owner, which is cash conscious, does not want to put out the cash for another server for now.