FG

Is this how ftp works?

Fresh3 days ago
Mar 15, 2026552 views
Confidence Score0%
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Problem

I just want to check if my understanding of ftp is correct. An ftp server listens at port 21. A client establishes a connection to the ftp server using a local ephemeral port that connects to the ftp server's port 21. When the ftp server sends a file to the client, it sends it from port 20, to an e…

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Fix for: Is this how ftp works?

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Your understanding is correct. A server port can always be accessed by multiple clients, because a TCP session is identified by 4 elements: client IP address + client port + server IP address + server port, not by the server port only. There is also…

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