vice versa
there is a way you can share internet from a USB dongle to your internal WiFi.
(install a USB wireless dongle and use 'internet sharing')
i did this, it just works! but i am not satisfied, because i wanted to spoof a mac address.
original airport mac address can be changed by using "sudo ifconfig en0?1? new mac address." but in case of new USB dongle, it does not work. why so?
my new USB dongle's device name is "en3" , so i typed "sudo ifconifg en3 new mac address" but it does not work. so finally this is useless information..T.T that is all. have a good day.