Is this for Ethernet or WiFi network?
CL can use systemd-networkd or NetworkManager to manage Ethernet
connection.
if you have the
/etc/NetworkManager/conf.d/systemd-networkd-unmanaged.conf file, then
your CL is using systemd-networkd.
You can choose what to use to manage your network connection.
Depending on which program is managing network is the file you need to
modify to fix MAC address.
please read “man stateless” for info for switching between them.