A_T,
You know that the 192.168.x.x is an unroutable IP address. This IP address is only use for a close network. Lets start from the basic. You need to have all your machines to be in the same network IP and has to have the same subnet mask. You can check this by typing ipconfig/all on the DOS prompt. Then just use the router ip address as your gateway. before you use a static ip for your machines make sure you write down the DNS, WINS IP that your ISDN provider uses. Let me know if this works.