I don't even know if it's possible to bind 2 ip addresses to one network card. Perhaps you meant if each computer has 2 NICs? Even better, one computer can be configured to as a temporary router/internet connection system. Just pop in a cheap nic in addition to the one already pulling an ip address from the ISP and assign a private address to the other nic. Better instructions can be found at www.practicallynetworked.com. The easiest, best overall solution is to buy a router and link your switch to the router's lan port. The linksys brand is fairly cheap, but highly reliable in use, IMO.