Linksys makes a router/cable modem combo =)
I would also suggest making sure that if your not using a router to make your computers static ips... must be same subnet tho
computer 1 IP: 192.168.1.100
Subnet: 255.255.255.0
DNS: 192.168.1.100
Gateway: 192.168.1.1
computer 2 IP: 192.168.1.101
Subnet: 255.255.255.0
DNS: 192.168.1.100
Gateway: 192.168.1.1