In this post i will show you how to configure tunnel ipv6 over ipv4 . Which means connecting two different ipv6 network through tunnel . Check the lab below to understand it properly . As you can see red markings is ipv6 networks configured but it is interconnected with ipv4 network . So to communicate these two IPv6 networks we will make a tunnel . As you can see in picture below , tunnel is been created over ipv4 .