Generally we use IPv4 in all our networking devices/environment/test bed. But Some special cases requires IPv6 address. There are plenty of resources available in the internet for Mininet with IPv4.
In this blog, we discuss about using the IPv6 addresses in the Mininet Topology. We also discuss about, How to do Ping and TCP, UDP Traffic Tests (IPerf) with IPv6 addresses.
Some basic concepts of IPv6 addresses