This article briefly introduces the relevant knowledge of IPv6, and describes how to connect to the IPv6 network through the free IPv6 tunnel provided by Hurricane Electric. IPv6 is the next generation of network technology, providing an ultra-large address space of 2^128, which is equivalent to 3.4x10^38 in decimal form. This means there are 6.7x10^23 addresses per square meter on Earth (for comparison, Avogadro's number is 6.02x10^23, which represents the number of molecules in one liter of gas). Similar to IPv4, some IPv6 addresses will be wasted, but even with the most conservative estimates, there would still be 1,600 addresses per square meter. This will fully meet human needs for the foreseeable future.