Google Translation:

About IPv6 user access to GZTown

IPv4/IPv6 dual stack access
Most mobile users do not have a public network IPv4 address, so the connectivity is poor. Most mobile users access IPv6, so they can access IPv6. IPv6 access can improve the direct connection between users. The prerequisite is that peers can also be interconnected by IPv6 users. IPv4 and IPv6 are not interoperable. In view of the fact that the current IPv6 user base is small, Ipv6 fails to achieve the optimal speed, but the development of IPv6 is the trend of the times.
Details:
forums.php?action=viewtopic&forumid=2&topicid=1654
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About IPv6 user access to GZTown.
GZTown is Dual-stack. Users do not need to change settings with IPv6.
For More details :
forums.php?action=viewtopic&forumid=2&topicid=1654