Originally Posted by Nosnosna
Most cable and DSL providers will give you a single IP address with your service. You can get a second IP address from them, usually for a few extra bucks per month. This isn't the best option, though.
What you should get instead is a router... this will allow multiple computers to share a single IP address. Both computers will connect to the router, and the router will, in turn, connect to the modem. From the DSL company's point of view, you'll still only have one device connected to the internet.
If they aren't already, you'll want to set your computers up to use DHCP, so that when they connect to the router, it will automatically configure them. You will need to connect to the router (the instructions that come with it will tell you how to do this) to configure it the way your computer is currently set up.