What MAC address filtering does is limit who goes onto your wireless network. The "MAC' stands for media access control. A useful fact to know is that MAC addresses are found on both wired and wireless devices and consist of six groups of 2 hexadecimal digits (0-9 and A-F) separated by dashes. If one were to use a laptop, they could find the digits on the bottom of the laptop, or could be found in your system. To find it, you would have to go to 'start', then 'run', then type in 'cmd', and then 'ipconfig/all', which should lead you to the discovery of your MAC address. Every network has its own special cite which excludes all computers except for those you type in. MAC address filtering is not a full proof technology, it is easily hackable but it is only temporary. MAC address cloning allows one device to appear to be another by copying its MAC address, and go back to normal after a reboot. If your ISp binds your service to your PC's MAC address, a broadband router can clone it. This is basically what MAC address filtering does. It is a way to include only those computers you wish to include, it excludes the rest.
