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How does nat protocol realize QQ access?
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.