MAC address spoofing not working in macOS 12 Monterey

sudo ifconfig en0 ether [MAC address]

Now results in

ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address

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Posted by
Dynjo
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  • I have also noticed that with Big Sur.... It does not work even after disabling system protection (csruilt) I guess apple is removing that feature from Mac OS.

    ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address

    —
    yeknomhtooms
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Just wanted to add to this chaos. I can also confirm mac address changing of ethernet adapters does not work on OSX Ventura as newts pointed out. I even ordered the Apple Thunderbolt 3 USB-C to Ethernet adapter thinking it would work but it does not. The newer M1 Macbooks do not have the older thunderbolt ports. Does anybody have a list of USB-C to Ethernet adapters that is known to work like newts mentioned?

Posted by
debounce
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  • What continues to work for me in macOS Ventura 13.5 (but also including Sonoma Dev. Beta 1 last time I tried) is this:

    Apple TB3 (USB C) <-> TB1/2 adapter + Apple TB1/2 <-> GbE adapter

    It's pretty expensive if you don't have either, but it does seem to work quite well. It uses the same chipset as in the older Thunderbolt (non-USB-C) display, which also seems to work. (You may even be able to find some used hardware)

    I started a new thread but it hasn't been approved yet - I'll link it soon.

    —
    newts
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Hi guys,

after trying to solve this on Ventura 13.4.1. I came to conclusion that macOS won't accept any mac address - you need to be careful to generate a mac address with apple vendor prefix. You can use this tool to generate a new mac address https://dnschecker.org/mac-address-generator.php and for apple mac address prefixes you can use this link http://www.coffer.com/mac_find/?string=apple to find them out or just google for them.

You would first need to run this to disassociate from all networks

sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z

and then run the following command

sudo ifconfig en0 ether XX:XX:XX:XX:XX:XX (generated mac from dnschecker tool)

I hope this helps! I can finally use my hotel's wifi again! Yaay!

Cheers

Posted by
gugugaga
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  • Hey guys! I've been looking through all these comments and I've tried a few things but no avail. The most recent one I've tried is the tutorial posted by @gugugaga, but this is what I got in return

    "en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 options=400<CHANNEL_IO> ether 3c:22:fb:08:7c:25 nat64 prefix 2607:7700:0:28:0:1:: prefixlen 96 zsh: command not found: 1C-EC-3B-ED-35-03"

    Does anyone know what I did wrong and what I can do to fix it? I'm running 13.5.1,

    —
    Geomariana1
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Why do you need to change the MAC address? If it's to test routes, below probably won't work.

On the other hand, there are situations where it does work, as I verified on Sonoma.

Change the MAC address in a virtual machine. It might get you what you need.

Posted by
mklingel
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