To protect your wireless router from unauthorized access the first and easiest thing you should do is to make sure encryption is turned on and is required for anyone to connect to your network. Next you should get your network router to disable the broadcasting of SSID (Network name). This stops your network from being listed when a user searches for a new network in your area. To connect to your network the user will now have to know both the SSID and password for your network. Finally if you have a small set of computers which dont change frequently, you could add the MAC addresses of your computers to your wireless router. MAC addresses are unique computer identification codes which are guaranteed to be unique for each computer.