On the Public Cloud, the IPv4 is configured by default and its reachable via ping request. There is also an IPv6 address assigned however its not configured. There is only a single IPv6 address assigned on the Public Cloud so it would be an /128 for the IPv6 address.
nano /etc/network/interfaces The IPv6 would have the following configuration: Depending on the Operating System, you may need to edit the adapter name accordingly, in our case its listed as eth0. iface eth0 inet6 static address 2001:41d0:0302:2100:0000:0000:0000:0000 netmask 128 post-up /sbin/ip -6 route add 2001:41d0:0302:2100:0000:0000:0000:0001 dev eth0 post-up /sbin/ip -6 route add default via 2001:41d0:0302:2100:0000:0000:0000:0001 dev eth0 pre-down /sbin/ip -6 route del default via 2001:41d0:0302:2100:0000:0000:0000:0001 dev eth0 pre-down /sbin/ip -6 route del 2001:41d0:0302:2100:0000:0000:0000:0001 dev eth0 Once we have set up our address we need to restart the network so that the settings are applied. service networking restart