Hi,
First let me give you steps how you can make your router secure from unauthorised access which your neighbours are doing
You need to login to the router setup page after connecting the router with pc via a cable
Connect to the Wireless G Broadband Router by entering http://192.168.1.254in the address field of your Web browser. Once you’ve logged in, the browser will display the administrator menu on the left-hand side of the screen, with the five configuration options — Wireless (Settings)
Encryption — Select "None," "WEP," "WPA," WPA2" or "WPA2 Mixed."
• WEP: Wired Equivalent Protocol.
• WPA: WI-FI Protected Access (WPA) is an intermediate solution for security issues. It uses Temporal Key Integrity Protocol (TKIP) to replace WEP.
WPA Authentication Mode — "Enterprise" uses an external authentication server (e.g., RADIUS) and EAP just as IEEE 802.1X does; "Personal" uses pre-shared keys without the need for additional servers. Both options will generate a master session key for the authenticator (AP) and supplicant (client station).
WPA Cipher Suite/WPA2 Cipher Suite — Choose either TKIP or AES.
Pre-Shared Key Format — Select passphrase or hex characters.
Pre-Shared Key — Enter up to 128 characters.
Authentication RADIUS Server — Enter a port, IP address and password.
You can also read the manual of your router from the link i am providing
Let me know if this will help
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