[lwip-users] Timeout Remote Client: SYN-SYN/ACK needs approx. 2-3s

[sb80]

Hello,

I have LwIP Ver. 1.2.0 and the following Problem.

The device (µC) which use the LwIP have following functions.
- A client (DC) in the device will connect to a PC-server (PCS) with the
Port 2111). 
- A remote client (RC), a customer computerprogramm on WinXP, will sometimes
connect to the Device-server (DS) with the Port 2111.

The Problem is, that if the client (DC) will connect to the PC-server (PCS)
, but the port from the PC-server (PCS) is not open or doesn't exist, i get
often a timeout (because time between SYN-SYN/ACK is to long) from the
remote client (RC) if i start a connection to the Device-server (DS).

If the Port 2111 at the PC-server (PCS) exist it works fine, i haven't a
timeout problem from my remote client (RC) and the time between SYN -
SYN/ACK is short. 

Curios is, that if i use Win7 instead WinXP i have at rare intervals the
problem.

The Wireshark Log (WinXP)  wireshark.out
<http://lwip.100.n7.nabble.com/file/n21107/wireshark.out>  

Is this a LwIP problem, because of old connections?
Why i get a long time between SYN - SYN/ACK --> approx. 2-3s
Why is the problem extrem with WinXP?
Is the time between a previous state (like FIN or RST/ACK or ...) to short
before a SYN from the remote client (RC) is send?

Has anyone a idea??

Thanks

Stefan

 



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Thanks
Stefan
(Germany)
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