IPv6 is enable in Ubuntu by default, but I have found that without experiece you can spend a lot of time to find information for IPv6 network configuration and operation. How to change IP address permanently Make changes in file /etc/network/interfaces iface ens4 inet static address 192.168.0.254 netmask 255.255.255.0 gateway 192.168.0.1 iface ens4 inet6 static address 2001:db8::254 netmask 64 gateway 2001:db8::1 Temporary IPv6 Address Assignment stack@devstack# ip address add 2001:db8::254/64 dev ens4 Temporary IPv6 Address Deletion stack@devstack# ip address del 2001:db8::254/64 dev ens4 Verify IPv6 address configuration stack@devstack# ip address dev ens4 3: ens4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 00:50:00:00:04:01 brd ff:ff:ff:ff:ff:ff inet 192.168.0.254/24 brd 192.168.0.255 scope global ens4 valid_lft forever preferred_lft forever inet