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Re: [lwip-users] TCP connect problem

From: Kieran Mansley
Subject: Re: [lwip-users] TCP connect problem
Date: Thu, 24 Feb 2005 14:23:37 +0000

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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