You need a router to make it al work.
MAKE SURE YOU ROUTER HAS AT LEAST 4 PORTS
1. hook up cable modem to WAN of router with Cat5 wire.
2. hook up Cat5 wire from lan ports of router to both computers.
3. Sometimes you may need to reset cable modem to alow the change of mac address.
4. It may go mess up every once in a while which u will need to unplug it and plug it back in.
5. Get A Dlink Router
6. Don't forget to jam 5 CATs up Thug's ass. Then reboot.