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The Private port is used for multi-computers, which might use the same service.
For example, if you setup three Web server(80) in your LAN, which are 192.168.123.7,
192.168.123.10, and 192.168.123.77. You can assign different public port to different IP. The public
port can be set at any port. But please must avoid the confliction. And anyone who would like to
connect must be aware of the port difference.
Public Port Private Server IP Enable
777 80 192.168.123.7 V
888 80 192.168.123.10 V
999 80 192.168.123.77 V