Ftp port question

From: Zeng Puyang (zbridge98@xxxxxxxxx)
Date: Wed May 02 2001 - 00:53:08 GMT-3

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hi, group:

I am a little confused by the ftp ports, and hope you can help me to make this
clear:

A: ftp client B: ftp server

  Standard mode:
   A tcp >1023 -----> B tcp 21
   A tcp 20 <----- B tcp X (X>1023,choiced by B)

  Passive mode:
   A tcp >1023 -----> B tcp 21
     PASV ----->
                <----- portY (Y>1023)
   A tcp 20 -----> B tcp Y

Is this correct?

Thanks for your help

Zeng
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