Thanks for your prompt answer.

It seems the collector see all the network traffic. If it can help, I was a 
problem : my sflow
sampling rate was 8192 and ntop were showing me nothing. On an advice of this 
mailing list, I modified

plugins/sflowPlugin.c:  myGlobals.device[deviceId].samplingRate = 
sample->meanSkipCount;
and put
plugins/sflowPlugin.c:  myGlobals.device[deviceId].samplingRate = 0;

Since this modification, ntop seems to work and the sampling rate is now 1. But 
I did NOT understand
what this change can modify... Maybe this disturbe the calcul of the traffic ?

Cheers,
Fabrice

Nick Weaver a écrit :
> What is sending SFlow packets, and are you sure it can see your traffic?
> 
> Problems like this are almost always caused by placement of the
> sniffer/collector. 
> 
> Nick Weaver
> Manager, Lab Infrastructure
> 
> [EMAIL PROTECTED]
> P: 801-852-9500
> 
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
> Fabrice ANDREI
> Sent: Friday, August 25, 2006 5:10 AM
> To: [EMAIL PROTECTED]
> Subject: [Ntop] About values related by ntop
> 
> Hi,
> 
> I have still a problem with ntop. I configured it as sflow collector,
> and it seems to work fine. But
> I don't understand values it provide :
> in the page "All Protocole > Troughtput", I can see my computer with
> "2.0 Kbps" in the columns
> Data/current. Normally, I would have 2.0 Gb (This is what firefox said
> when I am downloading a very
> big iso file) ! I have the same problem in all pages : values aren't
> what they sould be...
> Any idea ?
> 
> Cheers,
> Fabrice

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