[PLUG] Deciphering ethereal capture

Galen Seitz galens at seitzassoc.com
Thu Jun 27 15:19:16 UTC 2002


Just wanted to confirm that I see the same problem here.  

ncftp version		mode		results
3.0.0			active		works
3.0.0			passive		works
3.0.3			active		works
3.0.3			ext passive	hangs

Note that 3.0.0 is running on a rh 6.2 box, and 3.0.3 is on a rh 7.2 box.
Each machine is behind its own floppyfw firewall.  The two firewalls
are similarly configured.

Looking at the hang, I see the server respond to the extended passive
request, but it never responds to the connection setup on the second
port.

     62 22.623059   boron.seitzassoc.com  159.121.106.248       FTP      Request: EPSV 
     63 22.665843   159.121.106.248       boron.seitzassoc.com  FTP      Response: 229 Entering Extended Passive 
     64 22.665894   boron.seitzassoc.com  159.121.106.248       TCP      1726 > ftp [ACK] Seq=1013144841 Ack=399556790 Win=5840 Len=0
     65 22.666071   boron.seitzassoc.com  159.121.106.248       TCP      1727 > 51124 [SYN] Seq=1020129287 Ack=0 Win=5840 Len=0
     66 25.663831   boron.seitzassoc.com  159.121.106.248       TCP      1727 > 51124 [SYN] Seq=1020129287 Ack=0 Win=5840 Len=0
     67 31.663448   boron.seitzassoc.com  159.121.106.248       TCP      1727 > 51124 [SYN] Seq=1020129287 Ack=0 Win=5840 Len=0


galen





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