hi. Plug the 2 PC's into a switch with a straight through network cable, then connect this switch to the router or switch that has access to the router and internet. Let the switch assign a DHCP address to the PC's. Then do a IP config via CMD in windows and check what address was assigned, then use this address to set that particular unit to static IP and the same on the other PC, then update the network.ini file with those addresses. the PCs will talk for Model2 and also see the internet.
Well that's how I did it and no dramas.
Thanks