Detective Method: Use a Network Monitoring Software Tool
A software called MoocherHunter can be used to locate wireless hackers from traffic they send onto the network. This tool is also used by law enforcement agencies in Asia to track WiFi hackers.
Note: We are not in favour of using this tool as you may end up having a physical confrontation with your neighbor. 😀
Moving Forward: Increase Your Wi-Fi Security
The last step is to increase your wireless network’s security. If you are using WPA2 or WPA you are pretty much secure. If your connection isn’t encrypted or if you’re using WEP—which is very easy to crack—your Wi-Fi is fairly vulnerable to anyone looking for a free ride. If you are not sure which encryption type you are using, go to wireless connection properties and see there.
Things To Remember
You should always use WPA/WPA2 encryption to tackle WiFi hacking. For gaming consoles like Nintendo or other devices(which doesn’t run on WPA) the best way is to have a separate open or WEP encrypted network.
Also check out Top 10 Uses Of Wi-Fi Other Than Connecting To The Internet.