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Re: [lwip-users] TCP window update and TCP DUP ACK

From: deepaknaik
Subject: Re: [lwip-users] TCP window update and TCP DUP ACK
Date: Thu, 25 Nov 2010 22:18:14 -0800 (PST)

Yes, We are getting this problem repeatedly. 

Kieran Mansley wrote:
> On Wed, 2010-11-24 at 07:08 -0800, deepaknaik wrote:
>> Hello all, 
>> I am using LWIP 1.3.1 version which is ported on my board. I have a web
>> page
>> in my flash which is more then 40KByte. I have connected the board with
>> the
>> PC using Cross cable to access the webpage from board continously. But
>> inbetween PC stop accessing the web page from board. I have captured the
>> transaction between PC and my board using Ethereal. When I go through the
>> capturing details, PC sends TCP window update request to my board. And
>> after
>> some transaction I am getting "TCP DUP ACK" and transaction stops. 
> It looks like two packets from the lwIP end have been dropped.  lwIP
> should wait a little while and then retransmit them but either it
> doesn't or they also get dropped.  My guess would be that the lwIP
> timers aren't getting called correctly as the TCP retransmission code in
> lwIP is based around these timers.  Alternatively there is some problem
> like lwIP has run out of packet buffers because they haven't been freed
> properly.  Is this problem repeatable?  Is it always the same?
> Kieran
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