Originally Posted by thijsseh

The easiest way to stop the neighbor borrowing your signal is to use MAC filtering. I use this with my SMC ADSL modem / wireless router. In the setup of your router you should find 'MAC filtering' (or words to that effect) and you just enter the MAC address of your wireless device(s) and activate MAC filtering. It will then only accept the wireless divice(s) that are in its list and not your neighbor's one. The MAC address is a unique number, found by running 'ipconfig /all' (in a DOS window). It consiste of 6 (I think) groups of 2 hexadecimal combinations each (something like 00-2F-27-9A-C3-D2).