From: Wayne Gustavus (wgustavus@xxxxxxxxxxxxxx)
Date: Thu May 10 2001 - 13:16:35 GMT-3
One minor correction on the passive-mode FTP. One would think that the FTP
client would initiate the data transfer connection to the server with a
source port of 20 (or keyword ftp-data). However, this is NOT the case. In
passive mode FTP, the client simply chooses the next avail port >1023 as its
source port and uses the destination port it received from the FTP server as
the destination port.
Skeptics can check out the IPJ article by Tom Thomas here
http://www.cisco.com/warp/customer/759/ipj_2-3/ipj_2-3_oneb.html ,
or TCP/IP Illustrated Vol 1, or better yet, a quick sniffer trace!
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