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RE: [lwip-users] strange tcp connection issue

From: Muhamad Ikhwan Ismail
Subject: RE: [lwip-users] strange tcp connection issue
Date: Sat, 12 Jul 2008 10:23:28 +0000

On my implementation i have an telnet-like server for runtime system information exchanged.
A friend of mine had tested it and told me of the same thing though i havent seen it myself. I was planing on
doing some test next week. Apparently if he keep on logging in to the server frequently (per mouse click)
at some point the server stops listening and wont accept connections. The stack itself is still ok as other
program is running ok and the stack can be pinged.
Like I said i am gonna take a look at it on monday and i might have something to post. My implementation is the
1.3.0 release.


> Date: Fri, 11 Jul 2008 12:32:32 -0700
> From: address@hidden
> To: address@hidden
> Subject: [lwip-users] strange tcp connection issue
> On my platform I have an ftp server listening on port 21. During
> automated testing, where the ftp is accepting and closing connections
> frequently, the target will sometimes stop listening on port 21 for no
> apparent reason. All other apps listening on other ports still
> function correctly. I've debugged it down to where I find a
> discrepancy between the socket layer and the stack:
> I have a real time display which shows the state of all sockets
> current active in the system. At the time of the problem, this
> correctly shows a TCP socket listening on port 21. To get this data,
> I dereference the socket->conn->pcb.tcp->state variable in the user
> application context. I also added some code to tcp_input to print out
> the tcp_listen_pcb list if no matching PCB was found for the incoming
> segment (down by where it calls tcp_rst). What I found was
> interesting. I see something like the following:
> listening on port: 1030
> listening on port: 1027
> ...
> listening on port: 0 <-- this one WAS 21, but now isn't.
> Any ideas on what might cause such a discrepancy? This is a late 1.2 cvs head.
> --
> Thomas Taranowski
> Certified netburner consultant
> baringforge.com
> _______________________________________________
> lwip-users mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/lwip-users

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