Your pc to change its MAC address.

If you want your pc to change its MAC address on boot add that to a script in /etc/init.d/ folder, and also add symbolic link(ln) to /etc/rc2.d, /etc/rc3.d, /etc/rc4.d, /etc/rc5.d which refers to the script in /init.d/
script:

#!/bin/bash
ifconfig eth0 down
ifconfig eth0 hw ether 02:01:02:03:04:08
ifconfig eth0 up
/etc/init.d/networking restart