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Is this a cable modem/router? If so, who is the maker?
Your ISP will assign a IP address via DHCP to the MAC address of your modem. If you are using a modem/router, then the router will host your ISP IP. Most people are not aware that when you change modems, in order for it to work you need to call your ISP and give them the MAC address of the new modem. The default network of Linksys routers is 192.168.0.0 The router will acquire the IP address of 192.168.0.1 by default. That IP is you default gateway, because via that IP (which is the router) is the gateway out of your internal network. The 255.255.255.0 as mention in an earlier post is the Subnet Mask. The Subnet Mask is used for IP subnetting (something that you do not need to know). Now that the 192.168.0.1 IP is being used by your router, you can assign your first computer the IP address of 192.168.0.2 and your second computer as 192.168.0.3 If your router is a linksys, you will need to access the software inside the router to configure. To do that open up Internet Explorer and type in 192.168.0.0 and press enter. A login page will appear. There is no login name and the default password is "admin". Press enter and go to the ADVANCE tab located at the far right. Now look for a tab that says DMZ. Click on it and you will be able to enter the last octet of the IP address you wish to act as the DMZ host. If you want your second computer to be the DMZ host, the you will need to enter the last octet of its IP, which in this scenario is ".3"
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