Just set the DHCP lease to last for at least 7 days. This is a reasonably long term lease. Then configure the router so the same device can keep its IP addresses. Static leases is one way of doing this that most cheap devices implement. I can't tell you how to do it because I don't know which router you have, and I don't know how to configure every router on the planet.
Read the manual and or the help files.
I think my router, dosen't have that option. But I will look into some more.
I have another question. Do you know what files are add or change, that are outside the Dir C:/programfiles/activision/startrekarmadaII?
I got it to work. It either patch, virtual server, or window fire. But don't think it real that.