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Re: SV: [lwip-users] TCP problem

From: Kieran Mansley
Subject: Re: SV: [lwip-users] TCP problem
Date: Wed, 21 Oct 2009 12:15:35 +0100

On Tue, 2009-10-20 at 18:51 +0200, address@hidden wrote:
> Continuing this on lwip-devel...
> Jan Wester wrote:
> > Hi
> > I change my WND to 1024 (2*MSS) and now it works
> >
> > Thanks Simon and Kieran for your help
> >   
> Kieran, I studied Jans wireshark logs and indeed it looks a little 
> strange that the window doesn't open unless it reaches 0, although lwIP 
> was sending ACKs all the time. Is this an intention of the window update 
> threshold mechanism? I thought it was only to not send (duplicate) ACKs 
> that only contain window updates, not to prevent window changes at all?

My intention was that it would only affect the sending of explicit
window updates.  Normal ACKs should contain an up-to-date window.  There
might be some "silly window avoidance" that is getting in the way.


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