iface eno1 inet static address 1.2.3.4 netmask 255.255.255.0 gateway 1.2.3.1 up route add -net 1.2.3.4 netmask 255.255.255.0 gw 1.2.3.1 eno1 up ip addr add 4.3.2.1/32 dev eno1 down ip addr add 4.3.2.1/32 dev eno1