I'm wondering if anyone has had any success running a router from home off a cable modem? I have several KNOPPIX cable ready PCs in my home office and would like to run them all concurrently off the cable modem. Is this doable?

I know, I know, I've already been told to use a hub and iptables, etc. I don't have any hubs laying about and I don't see any for cheap. I'm wondering if there's a cheap and easy way to do this?

TIA,