Changing MAC Address in Backtrack

Hello guys ...today we will see how to change MAC address in backtrack.

First let’s see what is MAC address-- -, or we can say it as a Hardware address or Physical Address of a particular machine ,also it is globally unique address  which is burnt in the network card itself.MAC comes in play when a computer wants to receive or send data to proper destination.MAC addresses are 12-digit hexadecimal numbers (48 bits in length). MAC addresses are usually written in the under below format:

AA:BB:CC:DD:EE:FF

Now fire-up your backtrack machine.

Go to terminal & type:-
#ifconfig  eth0 down  (//The above command is used for disabling the eth0 interface//)

#macchanger –help  (//you will see list of available options)

You will see how to use it,& its basic usage is

Macchanger (options) device

Now for ex. If you want to see your present mac address simply type..

#macchanger –s eth0 (eth0 is mine interface)

Now in mac address the first three octet are given by manufactured,,our present MAC is AA.BB.CC.DD.EE.FF..

So here AA:BB:CC is given by the vendor & suppose if you don’t want to change..for doing it type..

#macchanger  -e eth0
#ifconfig  eth0 up

After ,hitting enter you will see your previous & fake mac address.

Now for changing your MAC randomly,type:-
again disable the eth0 interface by(ifconfig eth0 down)

#macchanger –r eth0 (then after bring the eth0 up again)

You will again see previous,& fake MAC address..