MacBook Pro 4.1 and OS X 10.5.5 : Possible to change MAC address?

Similar problem -- I upgraded my MacBook Pro 17" from Tiger to Leopard (10.5.5), and now can't change the ethernet MAC address. This is essential, since I often find myself staying in places where the broadband modem has been 'locked' to a single MAC address.

Following a fair bit of searching in various support fora, I tried various bits of command line geekery, and the shareware ChangeMac utility, all to no avail. Mac address remains stubbornly the same. This is seriously hampering my ability to work on the road, the whole point of carrying the MacBook Pro around! Anyone cracked this yet?!

(I read a rumour this might have been deliberately blocked to (a) prevent people from breaking their Time Machine settings and (b) stop people from spoofing for illegal purposes... if so, I'm deeply unimpressed... I really hope that's just a vicious rumour, and this is an unintended consequence of something else that will shortly be fixed...)

Are you doing "sudo" as well? All I can say is sometimes it works and sometimes it doesn't. On my Macbook, it didn't used to work on 10.4, but now it does. Your mileage may vary. You might also try using "lladdr" and various combinations of "up" and "down".

Hello,

I am under OS X 10.5.6.
I try every combinations of "up", "down", "ether", "lladdr", etc...but I never succeed to spoof the MAC address (either en0 or en1).
Please help...
Why ifconfig doesn't work on OS 10.5.6?

Thx

There have been changes in more recent versions of Leopard that have disabled MAC address modification in Leopard, at least for Apple-delivered interfaces.

People have reported successfully changing MAC addresses under Windows or other operating systems installed on a Mac, so it appears to be an explicit decision made by Apple enforced by driver-level changes in Mac OS X 10.5.6 and various AirPort updates.

Some people have reported some success in 10.5.5 and previous versions of Leopard by bringing down the interface, changing the address, and bringing it back up.

But some hardware platforms have had the restriction enforced at the driver level since day one.

Thx,

So there's no simple solutions for OS 10.5.6 user...
😟

Hello,

Is it possible to downgrade the ethernet driver with one of OS X 10.4.11 or 10.5.1?
ThX