I am lost. I had a configuration with was working, but my usb WiFi doogle does not work anymore. The configuration which was working Doogle on PC A with 2 ethernet cards. One connected to PC B: a laptop one connected to PC C Now, The laptop PC B is connect to a wifi mobile. It works wlp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.43.115 netmask 255.255.255.0 broadcast 192.168.43.255 I set the ethernet interface "shared to other computers" enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255 Now I am trying to connect this ethernet card to PC A