with router... you can use Xlink.
You in windows XP? Even if your not... this should work. run the networking wizzard... Setup network.. and allow sharing. It'll put your computers IP to "192.168.0.1" And then DHCP should be enabled. If it still doesn't work....
Go manually add your IP. Add it to somehting like "192.168.0.105" or some other # at the end... then see if it's networked.
I myself, don't use a router...
I got two internet connections. 1 going into my main PC, and I got a crosslink setup like above. I then have another ISP on my second computer (Also have it plugged into a hub... along with my third computer)
I know it's a bit more messy, and complex... and a router could do all this as easy as... pushing in a wire. I just... have this thing against routers, and their firewalls.... If your stupid enough to get hit by a worm... or dont run a personal firewall... then.. you deserve it... I like managing my own network... No wizzards... no auto config... my own settings, n I believe thats most secure.