I can't configure to use a static IP. Can this be a because of my router? In my /etc/network/interfaces I don't even have the lines: # The primary network interface auto eth0 iface eth0 inet static the network interface I get with ip a is enp1s0 and if I add (not real IPs) allow-hotplug enp1s0 iface enp1s0 inet static address 10.1.1.125 netmask 255.0.0.0 gateway 10.1.1.1 the network just doesn't work. Tried everything google found and nothing worked. Does anyone know what can be the problem and how to fix it?