How to Stop Your Neighbor From Stealing Your WiFi
- 1). Configure your router with the instructions provided by the manufacturer. Select a network name that is unique or different than your neighbors'.
- 2). Set up a security passkey or encryption on your router. This will be used to login to your connection. Use Wi-Fi protected access encryption if your router supports it. Create a strong password for your encryption key, and use a combination of more than 14 characters and letters. If your router's encryption is turned off -- which is common, especially upon unpacking the router -- your data is not encoded and the connection can be intercepted.
- 3). Use a 128-bit WEP or wired equivalent privacy key if your router is older and only supports WEP. Create a strong password for your encryption key, such as a combination of letters and numbers of 14 characters or more.
Source...