Step 4 -- Limit The Number of IP Addresses on Your Network
When one of your computers connects to your network, your router gives it an IP address, which every computer connected to the Internet needs in order to browse the Web.
Normally, your router just hands out these IP addresses willy-nilly to all comers. So any time a nearby wireless PC asks for an IP address, your router blithely hands one over, no questions asked. Friend or pest all get them.
But you can tell your router to only give out a certain number of IP addresses—one for each computer on your network. How does this help you? If the computers on your network use all the available IP addresses, it prevents your router from assigning an IP address to an intruder trying to connect to your network.
This trick varies somewhat from router to router. In the Linksys WRT54GX4, log in as an administrator and go to the Setup screen. In the box next to "Maximum Number of DHCP Users:" type the number of computers that will use your network, (both wired and wireless), and click Save Settings. That's all it takes. Now intruders won't be able to get IP addresses to get onto your network. If you add another computer to your network, make sure you go back to the Setup screen and increase the number of DHCP users by one.
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