eth0 again

[Amadeus W.M.]

> 
> If you disable NM, you need to enable network. From a local console (in
> other words, don't do this over a network session like ssh):
> 
> systemctl disable NetworkManager.service systemctl stop
> NetworkManager.service systemctl enable network systemctl start network
> 
> Thomas

Unfortunately the device is sill named em1, not eth0. So it's not NM. 
I don't understand why the udev rules files are ignored. Bug maybe? 
I'll report it and see what happens.