[lwip-devel] [bug #26528] TCP listen won't connect when FIN, ACks are received first

[Bill Auerbach]

URL:
  <http://savannah.nongnu.org/bugs/?26528>

                 Summary: TCP listen won't connect when FIN,ACks are received
first
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: billauerbach
            Submitted on: Mon 11 May 2009 10:41:03 AM EDT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

This is new - probably with the SYN/FIN changes I've seen pass by.  I rolled
back to a few months old code to verify the problem goes away, which it does,
and it returns when updating back to HEAD.

It happens when the PC has a connection terminated by lwIP and the PC is
sending FIN,ACK packets.  Then the lwIP system is started and lwIP will not
connect.  In fact, lwIP will not respond to any FIN,ACK, or later, any SYN
packets which occur as part of a PC timeout and a reconnect attempt (by the
application).

I can send a PCAP, but it's just a list of FIN,ACKs from the PC with no
responses.




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