Veridicus

My girlfriend and I have been playing for a while now, and an issue we've noticed is that sometimes the IP address will be for the internet router instead of the ethernet cable. The internet address causes all sorts of lag and in just downright unenjoyable. We have tried disabling internet before launching and after launching the game, but it will still sometimes pick up the internet IP, despite ipconfig saying there is only the local computer address and no internet address. I've tried modifying the server.config file as well, but it has no effect on LAN it appears. Anyone have any idea how to force the game to use the ethernet cable instead of the router? Thank you in advance.