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Understanding TCP/IP by Libor Dostálek, Alena Kabelová

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13.2 Active Mode of FTP Protocol Communication

Active mode is the basic mode of FTP protocol communication. The most frequently asked question is how the user can influence the option of the communication mode. The answer is hard to give because an FTP client developer must enable this option. Only some clients have such an option; Linux clients support the proxy command, but Windows clients doesn’t support the proxy command. On the other hand, most Internet browsers use passive mode. However, servers usually support both communication modes.

At first, we will briefly show a scenario of active communication in the following table:

Step

FTP communication

1.

C:\WINDOWS\system32>ftp ftp.ripe.net

Connected to hawk-ftp.ripe.net.

220 FTPD Server ...

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