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Hi, is it possible to change mac address of N900 via xterminal? Thank you for your posts

Should be possible with ifconfig. First bring down your WLAN, or make sure it isn't in use.

Then, as root:

ifconfig wlan0 hw ether 00:00:00:00:00:00

I know how to change, but i asked if is it possible, because some drivers doesn't support this function...

Yes it is posible.

there is macchanger in extras-devel, but be sure you know what you're doing, because extras-devel includes software that is untested, unstable and might brick your device, proceed with caution, you have been warned.

Is there a way to set it up so that the mac address gets automatically changed on start-up?

Put it in an upstart script.

I wrote a little handy script that help me a lot when needing a new mac fast on my n900 (its just bash so it works on every linux dist that names their vlan interface wlan0):

Create a file in /usr/bin/ called macchanger, make it executable:
chmod +x /usr/bin/macchanger
edit /usr/bin/macchanger and insert this text:

#!/bin/bash
echo "they block my mac"
ifconfig wlan0 down
ole=`ifconfig wlan0|grep HWaddr|awk '{print $5}'`
one=`df |md5sum |awk '{print }'|grep -o ..`
two=`free |md5sum |grep -o ..`
thr=`ps auxww |md5sum |grep -o ..`
ifconfig wlan0 hw ether 00:1FF:`echo $one`:`echo $two`:`echo $thr`
new=`ifconfig wlan0|grep HWaddr|awk '{print $5}'`
ifconfig wlan0 up
echo $ole "->" $new
echo "i fist their fish"

Reason i am using 3 strings md5sumed is to get decent randomization as this is hard to accomplish in bash

You do realize that `macchanger` is in the repositories?

After installing enhanced bash package, these lines don't work anymore:
It (the ifconfig) stops at $one, resulting in truncated addreas (only 4 out of 6, ie 00:1FF:xx). Tried changing to:
Now it works again