Method 2
1. Install nat 123 software on the intranet.
2. Enable nat 123. Add port mapping. Select the application that you want to publish from the internal network to the external network. Such as a port map of that website application 80 or a full port map of other or all application. You can use your own top-level domain name, or you can directly use the second-level domain name prompted by default.
3. After the domain name is mapped, you can access it with the domain name. It is as simple as that to realize external network access to internal network.