I scanned for hosts in our network and found a few other machines up. I then changed our gateway address to them one by one until I found one that was forwarding packets. Ended up being some Windows box. (ICS?)
So now I'm confused... how do they have a route out and we don't? Mystery.
I hope they don't turn off their computer... I'm loving this cable modem thing again. How long will it last? :-)