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However, if you have a DSL or Cable modem connection, your PC is connected to the Internet all the time meaning it is more likely to be a hacker target. Also, most ISPs will only give you one IP address for a single PC. If you have multiple PCs and a small home LAN, you cannot connect it directly to the Internet unless you have IPs from your ISP for each device. You can get around this by using a firewall. You are reading this FAQ through a DSL modem and firewall. I have about 10 devices linked through a single DSL modem with 1 IP address.

The features of firewalls vary by manufacturer. You can buy dedicated firewall boxes, or you can use a PC as a firewall runnign Windows NT or Linux (preferred by most). Most Linux distributions have the firewall software already installed and ready for setup.

The firewall becomes the one device connected directly to yoru DSL/Cable modem and uses the one IP given to you by your ISP. All traffic to and from your home network pass through this firewall.

The general idea of a firewall is controlling what traffic can get in and out. Most firewalls will allow common traffic out and replies back in. but most firewalls will not let unrequested traffic into your home network. This is a good thing. However, if you run things like mail or web servers behind your firewall, you need to provide a path for traffic to go into your home LAN. Other features often include time of day restrictions, user based access restrictions (great for kids!), web caching, and more.

Installing and maintaining a firewall is not trivial, but is well worth the trouble.