i have to change my MAC address in Ubuntu for temporary basis. so i do the following in the terminal:
ifconfig eth0 downfirst command will down the network, then 2nd command change my MAC [ 01:02:03:04:05:06 is replaced by my desired MAC address] and then 3rd one again up my network.
ifconfig eth0 hw ether 01:02:03:04:05:06
ifconfig eth0 up
to see the change type ifconfig in the terminal and press Enter. changed MAC address will be shown ...
simple ..... huh ;)
but remember there may be easier solution then that i dont know :(