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Asked: 2026-05-18T04:09:38+00:00

Recently I was designing a simple ftp. When a client connects to server, server

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Recently I was designing a simple ftp. When a client connects to server, server create a special Socket for this connection:

Socket clientSocket = listenSocket.accept();

I want to use this socket to send commands to server and create a new one to send data.
So I have two questions.

  1. Should I create a new socket for data only once, and remember reference, or create it whenever I need?
  2. How exactly can I Create it? On server side create a new Socket, and through clientSocket send a port number to client so it know which port it should use to send/receive data.

Appreciate Your advice!

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  1. Editorial Team

    You might look at the FTP spec here: https://www.rfc-editor.org/rfc/rfc959 Specifically, check out page 3. You’ll see FTP has a passive data port which waits for connections in addition to the control connection. Also, there is a diagram on page 7 which clarifies the typical FTP approach. Replicating it would certainly be a viable strategy.

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