Actually, when you surf the Internet, you use the pat protocol. Pat is nat multiplexing, and your internal ip address is followed by the port number, such as 192.438+068.0.2: 6.

This means that the port number is 6, and then it is 211.45.167.5438+012: 6 after going to the external network.

Every private address has a port number, which is the same as your port number in the intranet after being transferred to the public network, so that you can distinguish who is who.