Have to admit I've never tried it on a 770; One thing I can recommend trying to help troubleshoot is going into xterm, becoming root, and 1) type in "route" and see what the routing table shows (i.e. does it see your eth0 adapter with an IP), 2) do an ifconfig (and see if eth0 is listed and if it does indeed have an IP and 3) if both those are good try a ping to see if traffic will actually go across the interface. If the ping works then it's definitely something goofy with the ICD stuff...