auto ens3
iface ens3 inet dhcp
address 147.78.242.xxx
gateway 147.78.242.1
netmask 255.255.255.0
dns-nameservers 8.8.8.8 8.8.4.4
up ip addr add 2a12:a300:xxxx::xxxx/48 dev ens3
up ip addr add 2a12:a300:xxxx::xxxx:xxxx/40 dev ens3
up ip -6 route add 2a12:a300:3x00:0000:0000:0000:0000:0001 dev ens3
up ip -6 route add default via 2a12:a300:3x00:0000:0000:0000:0000:0001