You can't change the lladdr (ether/macaddr) while the interface is associated with an SSID.
First, disassociate from any network:
sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z
Then change your lladdr:
sudo ifconfig <intf> lladdr 00:bb:cc:dd:ee:ff
Then rejoin the WLAN normally.
squeeby
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