NetworkManager MAC randomization deaktivieren
Randomization during Wi-Fi scanning is enabled by default, but it may be disabled by adding the following lines to /etc/NetworkManager/NetworkManager.conf or a dedicated configuration file under /etc/NetworkManager/conf.d.
[device]
wifi.scan-rand-mac-address=no
Setting it to yes results in a randomly generated MAC address being used when probing for wireless networks.
https://wiki.archlinux.org/index.php/NetworkManager#Configuring_MAC_address_randomization