mac_eth0=$(ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}')
mac_wlan0=$(ifconfig wlan0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}')
ifconfig eth0 down
ifconfig wlan0 down
ifconfig eth0 hw ether $mac_wlan0
ifconfig eth0 up
ifconfig wlan0 hw ether $mac_eth0
ifconfig wlan0 up