mondalex

I actually wrote the exact procedure  Edit /etc/modules. Remove g_serial and add g_ether instead .... save and reboot.
 
But remember, it's still only a theory. I haven't tested this.

change your /etc/network/interfaces file to look like:
auto eth0 iface eth0 inet static     address 192.168.100.1     netmask 255.255.255.0  
and type
sudo ifdown eth0 && ifup eth0  
With that you should be able to ssh into the device using ssh USER@192.168.100.1

I think - you have to replace here eth0 with usb0
The following page is for the Raspberry, but could also help your OPi with the /etc/network/interfaces or the configuration within windows:
https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget/ethernet-gadget

Thanks  it worked!