There are five windows boxes connected to the linux box. They can ping each other, they can ping the gateway, and they can ping outside IPs. They only ping.
Browsers always time out.
I can't figure out why only one box works. I did notice one minor discrepency, however. I threw in a registry key to enable it on the other machines, but it didn't help. I can't imagine it being a problem with the linux box, but I'll post the the ip chains rules as soon as I get out of school. Hope this helps.