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