My post from another thread might help.
Quote:
To secure your Linksys make sure you change the following.
In the router settings change:-
1)Under Wireless/Basic Wireless Settings tab change the SSID and disable Wireless SSID Broadcast.
2)Under Wireless/Wireless Security tab change the Security mode, mines set to WPA Personel.
3)Under Wireless/Wireless Security tab change the WPA Shared Key : password.
4)Consider using the Wireless MAC Filter, for example mine just has the modem and Xbox 360 MAC in the list so nothing else is aloud.
5) Change the password you enter to get into the router config page. I think you do that from the Administration tab.
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http://www.cableforum.co.uk/board/34219326-post30.html