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PORT N+1to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20.
PORTcommand and allowing the server to connect back to its data port, the client will issue the
PASVcommand. The result of this is that the server then opens a random unprivileged port (P > 1023) and sends the
PORT Pcommand back to the client. The client then initiates the connection from port N+1 to port P on the server to transfer data.