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SV: [lwip-users] TCP connect problem

From: Jan Wester
Subject: SV: [lwip-users] TCP connect problem
Date: Thu, 24 Feb 2005 16:33:14 +0100

I allways wait to after close, and I have try with lwip-lwip in both end,
lwip-windows, and only if I reboot lwip

Jan Wester
Scheelegatan 11
SE-112 28 Stockholm
+46 8 449 05 30

-----Ursprungligt meddelande-----
Från: address@hidden
[mailto:address@hidden För Kieran Mansley
Skickat: den 24 februari 2005 15:24
Till: Mailing list for lwIP users
Ämne: Re: [lwip-users] TCP connect problem

On Thu, 2005-02-24 at 15:19 +0100, Jan Wester wrote:
> Hi
> Normaly I can do many TCP connect-close sequence, but if I restart my 
> system and try to do TCP connect I often got tcp_error.
> Is it any problem with seq no ? I using 0.7.2 On the sniffer I can see 
> SYN SEQ=6525
>         ACK=6533        Only ack ?
> And after lot of try it connect
> SYN SEQ=6595
> SYN ACK=6596        Connect

Sounds like one of the machines is interpreting the SYN as relating to a
connection that existed before the reboot.  As it thinks it's already open,
it responds with an ACK rather than a SYN-ACK, although I'm not sure this is
correct behaviour: I'd have to check the RFC to be sure.
Eventually, the connection times out and then the SYN succeeds.  

Are both ends lwIP?  If not, which one is?  Was only one machine rebooted?
If so, which one?


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