Hi,
I've been trying to change my MAC address -

ifconfig hw wlan0 00:11:22:33:44:55:66
as root seems to complete OK, but doesn;t 'take' - when I do

ifconfig

afterwards, it's back to the original.

Is it possible? How?

i have no idea how to do so, but there are means to accomplish that, packaged with a live cd distro that i muck around with. you can check them out at - http://remote-exploit.org/ and their forum, that you may be able to search - http://forums.remote-exploit.org/.

from what i do understand is that ifconfig lists the BIC (Burned In Card) mac address. to have it listed differently you have to have the OS step in when that command is run and answer back what you configure (by some outside means), instead of querying the card for the value.

OK, RTFM time

ifconfig wlan0 hw ether aa:bb:cc:dd:ee:ff

check out this link - http://www.irongeek.com/i.php?page=security/changemac

Sorry for bringing this old thread up again. I tried to use the command above

ifconfig wlan0 hw ether aa:bb:cc:dd:ee:ff

and I believe I successfully changed my MAC address but I cannot connect to wifis now anymore

I ended up at the same place when I tried this a while ago. I think support for changing the MAC address would need to be enabled in the (closed source) driver for this to work properly. If you're still having trouble connecting to wifi, reboot your device to get your old MAC address back.

-John

I have tried OS2007, OS2008, and OS2008 r&d mode.
tried wirelesstools:
ifconfig wlan0 down
ifconfig wlan0 hw ether XX:XX:X....
ifconfig wlan0 up
tried macchanger.

All lead to the same place. They will not let me reconnect to the network with the bogus MAC address.

Is it a credible mac address?? If you're just pulling numbers and letters out of your butt, then it's not going to work. The mac has to have a valid oui. Something like this, changed to will work. The first three pairs, , means it's a linksys card. The last three is the unique card id, , these are the numbers you want to change. Using something like most likely won't work. Most wireless routers know the difference between real, and made up numbers.

i followed the directions to the letter at work... didnt work.
so, i tried it at home with a controlled environment. still didnt work. it looks like this may just be driven by the hardware?

sudo gainroot
ifconfig wlan0 down hw ether 12:12:84:23:1f:62
ifconfig wlan0 up


with macchanger installed...works for me with that address I made up randomly.