[En-Nut-Discussion] ARP request stopps TCP connection

Steffen Brandt Steffen.Brandt at web.de
Wed Sep 28 11:49:52 CEST 2005

Hi  Michael,

thank you for your quick reply.

> I can't tell you why it closes after exactly 20 minutes - except that ARP is
> refreshed after 10 minutes so here might be the a dependence.

A longer test shows, that problems occure after 20, 30 and 50 minutes. I use the NutGetSeconds() function.  Currently I use Nut/OS Version (latest download from ethernut home page).

> What kind of OS is the streaming client running and are there any
> "protective" software running on it? 

I use a Terratec NOXON audio as streaming client. Therefore I can't say anything about the internals.
The network connection is bridged via a WLAN-Router.

I try to use different streaming client (e.g. Winamp on a PC) and look if the same problems are appear.


"Ethernut User Chat (English)" <en-nut-discussion at egnite.de> schrieb am 28.09.05 10:26:15:
> Hi!
> -----Original Message-----
> From: en-nut-discussion-bounces at egnite.de
> [mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of Steffen Brandt
> Sent: Mittwoch, 28. September 2005 10:08
> To: en-nut-discussion at egnite.de
> Subject: [En-Nut-Discussion] ARP request stopps TCP connection
> Hello,
> I used a Ethernut V1.3G board to stream audio data via TCP connection to a
> streaming client.
> All works fine. But after exact 20 minutes uptime of ethernut the TCP
> connection is going to so_state = TCPS_CLOSED.
> A trace of the TCP connections shows, that a ARP request is send from
> ethernut.
> Here is a part of the trace:
> = Ethernut
> = streaming client
> ...
> -----------------------
> looking at and have made some changes concerning the ARP and TCP interaction
> and there is some room for improvement which I hope to check-in at some
> stage - if we find that these changes fit your problem I would share them
> with out just for testing.
> Non-the-less, here it seems as if your Streaming client closed the
> connection anyway. This might indicate that the Ethernut side is not the
> problem. What kind of OS is the streaming client running and are there any
> "protective" software running on it? 
> Regards,
> Michael
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> En-Nut-Discussion at egnite.de
> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion

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