Re: [lwip-users] LWIP stops responding on ping and HTTP calls from a webbrowser

[Steven Woody]

On 22 April 2011 18:09, Oane Kingma <address@hidden> wrote:
> I think I had a similar issue a while back, it turned out I left some
> packets in the MAC's buffer when two packets arrived extremely close
> together in time and didn't feed them to lwIP properly. A new packet that
> would arrive would finally trigger the previous packet that was incorrectly
> left in the MAC's buffer to be processed. You may experience a similar
> issue.
>
> Best of luck,
> Oane

If I understand right, MAC code is not part of lwIP.


>
> On 22-4-2011 12:04, Ruben wrote:
>
> Dear all
>
> I am using Lwip 1.3.1 & 1.3.2 untill recently I had no problems using the
> stack.
> But now I'am experiencing something strange. I use a webserver and a telnet
> module.
>
> After a boot of the software everything works ok. I can Ping, acces the
> webserver pages, open the telnet server.
> But at a point the websever and ping stop working. In wireshark i see my PC
> sending request to the embedded device
> a STM32F217 but the stack does not send a respons.
>
> After some waiting the ping work again and the webserver is also reachable.
> however something for a short period.
>
> I am thingking that some resources on lwip the stack are not cleared
> properly and after a timeout period some parts of the stack are cleaned.
>
> when I stated using Lwip is was able to run ping and webserver for days
> without blocking or failing. But somehow this is compromised.
>
> does anyone have any sugestions or question on how to find out more about
> the problem.
>
> I set a breakpoint in the TCP.c and Tcp_in file where I think the program
> should proces any data. in normal operation this breakpoint is serviced
> however when the request from the PC is not answered the breakpoint is not
> reached.
>
> Thanks ik advance for everyone wo read this and might have a suggestion.
>
> Ruben
>
> --
> Oane Kingma
> KITT Engineering
> Pantheon 16        Phone :  +31 53 431 5700
> 7521 PR Enschede   Mail  :  address@hidden
> The Netherlands    WWW   :  www.kitt.nl
>
>
>
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narke
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