auto enp1s0
allow-hotplug enp1s0
iface enp1s0 inet static
    address 192.168.1.42
    netmask 255.255.255.0
    gateway 192.168.1.1
    up   ip addr add 192.168.1.43/24 dev enp1s0 label enp1s0:0
    down ip addr del 192.168.1.43/24 dev enp1s0 label enp1s0:0
    up   ip addr add 192.168.1.44/24 dev enp1s0 label enp1s0:1
    down ip addr del 192.168.1.44/24 dev enp1s0 label enp1s0:1