To the lengthening list of files on my server, I have added the output of

   strace -o strace.out -e trace=network ftp -u -n ftp.iglu.org.il

Upon an off-list suggestion. In this session, IGLU's reply to PASV has been

   227 Entering Passive Mode (192,117,122,34,46,28)

Which indicates port 11804. The strace output is at:

   http://192.115.21.202/pasv/strace.txt

It seems to me that the system call is made to the correct port, but, as we've
seen from the tcpdumps, it is somehow diverted to port 0.

Is there any way to trace exactly what the kernel's stateful inspection does to
packets?

Herouth

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