[howto] change your NIC's MAC under 2K/XP

[Shaidar]

If you don't have an option in the properties of your NIC to specify a "Network address",here 's how you change it:

Open your registry and navigate to this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4D36E972-E325-11CE-BFC1-08002BE10318}

Under this key you'll see subkeys 0000, 0001, 0002.

These are all the network devices installed on your windows.

Find the one for your NIC you want (look in "driverdesc").

Create a stringvalue key called NetworkAddress,

and fill in your desired macaddress.

E.g. "0050042DBC12" for a mac address 00-50-04-2D-BC-12.

So, you'll end up with a value which is:

NetworkAddress REG_SV 0050042DBC12

Reboot and check with ipconfig /all that your macaddress is changed.

Please make sure that you don't have 2 NIC's in your network now with the same MAC address .. you'll be presented with a lot of bluescreens..

If you use a MAC address of a NIC on another NIC, throw the original NIC away, or write it down somewhere that that MAX is taken ...

Edited June 27, 2004 by Shaidar

[ootput]

You'd better be careful.

[Shaidar]

some info added...

[ElectricDemon]

You'd better be careful.

I'm sure there's nothing wrong with changing a MAC address :huh:

[Shaidar]

I'm sure there's nothing wrong with changing a MAC address :huh:

No, normally not, only when you end up with 2 NIC's with tha same MAC address ... (but I added that info)

[[jon]]

my NIC shipped without a hardware MAC address :blink:

No, really, it has no MAC, this should be useful though so i can set a MAC :)

[Shaidar]

,Jun 27 2004, 14:29] my NIC shipped without a hardware MAC address :blink:

No, really, it has no MAC, this should be useful though so i can set a MAC :)

That is just impossible. Period :)

[Digital Pimp]

There are meant to be utils out there capable of masking you MAC address i had one at one point then realised i didnt have a use for it. No idea where i got it, search with your old friend Google it'll find it eventually.

[[idkfa]]

smac does that.

You don't have to reboot after changing your MAC, disabling and reenabling the device is sufficient.

[emel]

There are meant to be utils out there capable of masking you MAC address i had one at one point then realised i didnt have a use for it.  No idea where i got it, search with your old friend Google it'll find it eventually.

you can use any MAC with this unit, you will find some good use of it if you have cable internet.

Edited June 27, 2004 by emel

[60008_1437839557]

smac does that.

You don't have to reboot after changing your MAC, disabling and reenabling the device is sufficient.

Yep .

Very nice tool to troubleshoot security issues . :)

[tenozhou]

yeah.

I got it.

[OPaul]

Or you could use SMAC.

http://www.klcconsulting.net/smac/

[jack_canada]

Or you could use SMAC.

http://www.klcconsulting.net/smac/

cool

[xta]

Is this process reversible simply ie. by deleting the addes reg value?

[Pink Floyd Veteran]

and what is the utility of doing that?

[Shaidar]

Yep, actually it doesn't change your MAC .. it just let Windows believe "the network" that your card had another MAC...

Deleting the registry key will get you you original MAC...

[xxpor]

What will happen exactly if you get the same mac addy?

[aek007008]

你们是不是都喜欢用D的

[thetman]

not to be rude or something but why would you want to change your MAC address?

[futb0l]

You wanna change it maybe for changing IP given by the ISP ( if you have dynamic IP ).

and also... I don't think you need to reboot your computer just Enable/Disable the Network Card in Device Manager.

[aladin167]

Actually KLC Consulting just released another MAC Address spoofer tool called SMAC-CL. It is a command-line tool (console app) so people can now automate the MAC Address spoofing. Cool eh?

http://www.klcconsulting.net/smac-cl

readme file is http://www.klcconsulting.net/smac-cl/smac-cl_readme.htm

Cheers,

/a :cool:

[Oblivion]

pretty nice ;)

[johngalt]

my router has the ability to spoof the MAC of th NIC on my computer that was used to set up my Cable modem - I used it b/c it would not otherwise connect to the Internet once the Comcast tech left and I installed my router :argh:

[Snout]

handy nfo :) thanks