The only way I've ever used the ICS Control is to use it to broadcast my cellular data across wifi. Setting public interface to Cellular Line and Private interface to TNETW12511. Then checkmark the box that says "Set Private IP" But that involves setting up an SSID name in the network card section of wifi by selecting menu-> add new, then giving your network a name and selecting ad-hoc mode. You can give it that same IP address that you saw in ICS Control as "Private IP". Then when you have all of it running, you should see your newly named network show up on the network list on your laptop's wireless networks screen.
For laptop tethering I've always just found it easier to use the USB cord and WM6 Internet connection sharing which I believe is a manditory part of the WM6 roms. I link to the application through my 10 button comm manager.
Here is the forum over at XDA where people have gone through all different types of configs with this really incredible software...
http://forum.xda-developers.com/showthread.php?t=377047