Error changing MAC

[beatz]

Hi I'm trying to follow this tut to crack wpa2 but I cannot change my mac address! I keep getting this error:

ERROR: Can't change MAC: interface up or not permission: Device or resource busy

I tried these to change it:

macchanger -a wlan0
(or )
macchanger -r wlan0
(or )
macchanger --mac 01:02:03:04:05:06 wlan0

I also took a look at some threads on here and tried some other things but they that still couldn't help me fix my problem:
http://www.backtrack-linux.org/forum...-question.html
http://www.backtrack-linux.org/forum...c-address.html
http://www.backtrack-linux.org/forum...itor-mode.html

How can I fix this error?

[KMDave]

Well the error message tells you what to do in order to change the MAC address.

Read, understand, follow the instructions.

[2901119]

try

ifconfig wlan0 down

directly before using macchanger

[Strife]

while performing an authentication in an open network u try to mac address and u end up in an error ....this is a common error for a newby...but nothing big change has to be done...

The error is because when you cahnge your MAC address, having your WIFI on..

so jus try "iwconfig wlan0 down"

after that u try the command "macchanger --mac 01:02:03:04:05:06 wlan0"

so its done

[beatz]

try

ifconfig wlan0 down

directly before using macchanger

I tried that and got the same thing:

root@bt:~# ifconfig wlan0 down
root@bt:~# macchanger --mac 01:02:03:04:05:06 wlan0
Current MAC: f0:7b:cb:44:87:42 (unknown)
ERROR: Can't change MAC: interface up or not permission: Device or resource busy
root@bt:~#

EDIT:
Ok so I found the solution so this could be closed.

I thought about what dave said then realized that eth0 could be causing my problem. So I did:

ifconfig eth0 down

then

ifconfig wlan0 down
macchanger -r wlan0

And it was a success. Thanks guys, this had been bothering me for a while.

[Strife]

Good then....always hav in mind that "OLY IF U END UP IN AN PROBLEM UL LEARN HOW TO SOLVE IT"

[subco]

I'm running Backtrack R5 on vmware. I have the same problem. I have 4 interface on it (eth0,eth1,lo,tap0). I execute these command

ifconfig eth0 down
ifconfig eth1 down
ifconfig lo down
ifconifg tap0 down

but i got same error for eth0:

ERROR: Can't change MAC: interface up or not permission: Device or resource busy

I couldn't how Linux work with down interfaces!!!

So the solution was to disconnect 'eth0' hardly (by disconnect Network Adapter from virtual machine settings).

This post is just a solution.