Thanks to whoever gave me the tip over here... the ISP was filtering per mac address... that's why only one computer was getting out. And here I also give props to that belkin engineer who came up with the "clone PC MAC" function on their cheap little router... awesome.
Now MY router has emulates the PC's mac, the ISP router thinks is the PC and gives him the goodies. All other PCs can now get juice....
ISPs are evil
Belkin is good
Foo is awesome