(This article makes a low-level discussion on the concept and principle of IPv6. At the same time, because many Ipv6 learners do not have network devices that support Ipv6, it is difficult to combine theory with practice. Chapter 5 of this article firstly introduces some FREE authentic servers and how to use these resources to connect PCs to Ipv6 networks, and get the first Step by step Ipv6 practical experience.)