Comment from Nando Vieira
Time: January 17, 2008, 10:29 am

Is there any way to spoof the ethernet (en0) MAC Address? Used to work on Tiger, but stopped working after I upgraded to Leopard.

Comment from Allaire
Time: January 17, 2008, 11:49 am

I think you can spoof an ethernet address by doing sudo ifconfig en0 ether xx:xx:xx:xx:xx:xx

I find the wireless a lot more useful, and it shows just how weak the mac address filtering is as a security implementation on any network

Comment from Nando Vieira
Time: January 18, 2008, 9:48 am

Allaire, I need to use the ethernet connection because is the only one that’s available (at work, there’s no wireless). The command you sent still doesn’t work on Leopard.

Comment from ks
Time: January 26, 2008, 10:46 pm

Doesn’t work with ethernet connection. Works for my wireless. Any ideas how to get this to work for ethernet en0?

Comment from James Nevara
Time: January 28, 2008, 3:16 pm

Changing the above command to en0 worked for me in Mac OS X 10.4.11, I don’t have Leopard so I can’t verify:

sudo ifconfig en0 ether 00:e2:e3:e4:e5:e6

You can check if it worked by doing ifconfig, and your ethernet MAC address will be identified as that address

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Comment from Poptarts
Time: February 13, 2008, 6:48 pm

Changing or spoofing does not seem to work on the en0 (wired ethernet) of MacBook Pros even in 10.5.2. Does anyone know a way to resolve this issue?

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Comment from Horuden
Time: March 2, 2008, 1:00 am

Is there anyway to make the new address stick after I reboot?

Comment from James Wu
Time: March 7, 2008, 2:42 am

en0 can’t not modify after version 10.5.x

Comment from Jose Vigenor
Time: March 10, 2008, 2:52 am

Mac OS X : How to Set the MAc Address During Startup

Follow these steps to create a script that sets the MAC Address each time the computer restarts:

1. Open Terminal (/Applications/Utilities/).
2. Type: cd /Library
3. Press Return.
4. Type: mkdir StartupItems
5. Press Return. (If you encounter an error, continue to step 6.)
6. Type: cd StartupItems
7. Press Return.
8. Type: mkdir MACADD
9. Press Return.
10. Type: cd MACADD
11. Press Return.
12. Type: pico MACADD
13. Press Return.
14. In the pico editor, paste in the following text.

Begin copying below this line.
——————————————————————————–

#!/bin/sh

. /etc/rc.common

##
# Configure a network interface MAC Address setting
##
#
# This script will set the MAC Address setting for the specified interface(s)
#
# The name of the interface (ex. en0) must be edited to match the interface
# to which the MACADD setting should be applied
#
##

StartService ()
{
ConsoleMessage “Configuring MACADD”

### uncomment lines and change the value following ‘MACADD’ as appropriate mac address

if [ “${MACADD:=-NO-}” = “-YES-” ]; then

# /sbin/ifconfig en0 lladdr xx:xx:xx:xx:xx:xx
# /sbin/ifconfig en1 lladdr xx:xx:xx:xx:xx:xx

fi

}

StopService ()
{
return 0
}

RestartService ()
{
return 0
}

RunService “$1″

——————————————————————————–

End copying above this line.

15. Uncomment the /sbin/ifconfig line(s) to set the MACADD for a particular interface.

Note: Removing the number sign (#) from the beginning of a line uncomments it. Typically, en0 is the interface name for the Built-in Ethernet port and en1 is interface name for the AirPort Card. This is not always the case, though. To confirm that a network port is associated with a particular interface name, open the Network Utility (/Applications/Utilities/), and click the Info tab.

16. When you have finished customizing the file, save it (press Control-O), press Return, and exit pico (press Control-X).

17. Type: chmod 755 MACADD

18. Press Return.

19. Type: pico StartupParameters.plist

20. Press Return.

21. In the pico editor paste in the following text.

Begin copying below this line.

——————————————————————————–

Description
Can set MACADD
OrderPreference
None
Provides

MACADD

Requires

Network Configuration

——————————————————————————–

End copying above this line.

22. When you have finished customizing the file, save it (Control-O), press Return, and exit pico (Control-X).
23. Type: chmod 755 StartupParameters.plist
24. Press Return.
25. Type: sudo pico /etc/hostconfig
26. When prompted, enter your password.
27. Press Return.
28. In the pico editor, add this line at the bottom:

MACADD=-YES-

29. Save it (Control-O), press Return, and exit pico (Control-X).

When you restart the computer, MACADD is set for the interface that you specified.

Notes

1. The MACADD will be reset after changing a Location, waking the computer from sleep, or changing the state of the network interface. To use the script again without having to restart, enter the following command:

sudo SystemStarter start MACADD

2. If you experience any issues or wish to not set MACADD during startup, you can turn off the new script by changing the MACADD line in /etc/hostconfig to:

MACADD=-NO-

Comment from Math
Time: March 18, 2008, 6:34 pm

Some correction on the StartupParameters.plist
————–

{
Description = “HomeMade boot param”;
Provides = (”MACADD”);
Requires = (”Network Configuration”);
OrderPreference = “None”;
}
———-

So far it is not working with en0 (LAN), but works fine with en1 (Wireless)
under leopard 10.5.2