Analyzing FTP problems

FTP has two modes of operation:

• Active mode (ACTV): In this mode, the client initiates a control connection to the server, and the server initiates a data connection to the client
• Passive mode (PASV): In this mode, the client initiates both the control and data connections to the server

Both types of connections can be implemented, and they will be explained later in this recipe, in the How it works... section.

Getting ready

When working with FTP, if you suspect any connectivity or slow response problems, configure port mirror to one of the following:

• The FTP server port
• The client port
• A link that the traffic crosses

If required, configure a capture or display filter.

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