There are a few options you could take here... First off is a router. It's made to connect two networks(IE your modem then other computer, usally 4 others) Then, there's a device called a hub or a switch(a bit higher performace). Now a router will actually tell the modem to connect and give it the password and all. A hub/switch won't...BUT, I beleive your modem is one of these that actually will work with just a hub/switch. You should ask around, but I beleive it's westell that made ones such as this...