Change your NIC MAC-address

Sometimes you just want to change your MAC-address (For example to get new IP-address from DHCP server).
If you have luck you can change your MAC-address just with:

sudo ifconfig wifi0 down hw ether 00:11:22:33:44:55

but with my EeePC that didn’t work so I had to use software called MacChanger.

First we check what is my MAC-address right now:

whig@scriptkiddie:~$ ifconfig wifi0
wifi0 Link encap:UNSPEC HWaddr 00-15-AF-**-**-**-E0-E3-00-00-00-00-00-00-00-00
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:242 errors:0 dropped:0 overruns:0 frame:57
TX packets:195 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:280
RX bytes:26977 (26.3 KB) TX bytes:8970 (8.7 KB)
Interrupt:10

Then we just give two simple command:

whig@scriptkiddie:~$ sudo ifconfig wifi0 down
whig@scriptkiddie:~$ sudo macchanger wifi0 -m 00:11:22:33:44:55
Current MAC: 00:15:af:**:**:** (unknown)
Faked MAC: 00:11:22:33:44:55 (Cimsys Inc)

And then we check my MAC-address again:

whig@scriptkiddie:~$ ifconfig wifi0
wifi0 Link encap:UNSPEC HWaddr 00-11-22-33-44-55-E0-E3-00-00-00-00-00-00-00-00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:428 errors:0 dropped:0 overruns:0 frame:97
TX packets:219 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:280
RX bytes:42459 (41.4 KB) TX bytes:10074 (9.8 KB)
Interrupt:10

and as we can see my MAC-address has changed.

As you see it’s so easy to change your MAC-address that using MAC-filtter on your wireless network is pretty useless.

brodie7838

August 12th, 2009 at 11:14 PM · Reply

I like Technitium MAC Address Changer if you’re on a Windows box, though it’s super easy to change the MAC in the NIC properties without any additional software, or even CLI.

Petri

August 13th, 2009 at 9:52 AM · Reply

Thank you about your comment. I’ll have to check that MAC Address Changer asap.

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