Log in to the router first. See the reverse description of the router for the specific address, which is generally192.6438+068.438+0.438+0.
Click "Forwarding Rule-Virtual Server" in the navigation on the left, whose function is to map ports. Some routers may not have this name sometimes, but they have the same name. Look here.
For example, if the ip is192.168.1.102, click Add New Item. Write down the ip of this machine and the web port 80 to be opened to the outside world. The protocol is all, and then save and exit, as shown in the figure.
DMZ is equivalent to mapping all ports of your own host to one route, which is not recommended.