Have 12 seperate companies in small office bldg. Each company is wired (cat5) to a 16 port 10baseT hub. Hub wires to SDSL 2.3 mb single line router (modem). Each office connects with the same IP and SubNet. Problem: How to keep Office A from being able to go into Office B’s system etc.? Would a personal firewall surfice or do we need a 16 port DSL Router?
