Whats a MAC address?
A MAC address is a physical way of addressing your network card at a hardware level.
How to find out your MAC address?
Open up a terminal and run:
$ ifconfig wlan0 | grep HWaddr
Where I have wlan0 you would put your networking device.
wlan0 Link encap:Ethernet HWaddr 8c:a9:82:6c:9b:da
As you can see my MAC address is 8c:a9:82:6c:9b:da.
How to change your MAC address temporarily?
Open up a terminal as root and run:
$ ifconfig wlan0 down $ ifconfig wlan0 hw ether 00:00:00:00:00:01 $ ifconfig wlan0 up
This will have changed your MAC address to 00:00:00:00:00:01.
To show this run:
ifconfig wlan0 | grep HWaddr
This change will not survive a reboot.