Some Basic Tips of Wireless Home Security
1. Avoid using open (unsecured) wireless networks. Naturally, if you are at home you'll probably make use of your own network but you may still be tempted to use a neightbor's WiFi if it's open. Doing so can be quite risky though because such networks are open to everyone, even hackers who may be monitoring the wireless traffic, waiting for you to use a password or some private data that they can use to their advantage.
2. Turn off your wireless network if you don't plan to use it for a while. This way, not only do you save on electricity, but also reduce the risk of network attacks by a large factor. For example, if you go away on a long vacation, you won't be able to tell if someone has compromised your WiFi's security and may return home to a nasty surprise, but by simply pulling the plug off your router you eliminate this problem.
3. Change the default administrator password of your network and, if possible, the usernames too. Hackers are often familiar with the factory settings of various modem/routers, so by leaving them as they are you are practically leaving your door open to intruders. Changing the password/usernames is relatively simple and can be done by accessing your router's configuration. Also, it is a good idea to change the password periodically, e.g. every 2 months or so. Also, try to use a sufficiently strong one by mixing various character types, along with numbers is a big plus. For more information on this you can read a specialized article.
4. Turn on WPA / WEP Encryption. WPA is quite stronger but if your network doesn't support it, WEP is better than nothing. Secured networks can be identified when someone looks around and simply the existence of an encryption protocol is often a deterrent to many amateur hackers.
5. Enable firewalls on every computer in your network as well as on the router. A good firewall software (or external device) can really do wonders here, since this security measure contains signatures of most network attacks and can identify a hacker on the spot. This is a must-have in every network, particularly a wireless one and especially if you use MS Windows operating system. It usually takes more work to set up this security layer but it's worth the effort.
6. Turn off your wireless network interface. If you have a laptop or some other mobile device that you use in public, you should have the wireless network interface turned off by default. It's best to turn it on only when you really need it, in order to connect to a wireless network. For more information about wireless security on laptops, you can refer to this specialized article.
7. Disable remote network administration. Most WLAN routers are capable of being remotely administered through the internet, to make it more convenient for the person in charge of the network.If you are the only person who can use this feature, it is great, but unless you have defined a specific IP address for that taks, almost anyone on the web could seek out and gain access to your router. So, it is recommended that you disable this feature (if it's not turned off by default).