[mrtg] Re: negative values?

Billy McCord billymccord at yahoo.com
Mon Apr 22 22:39:25 MEST 2002


Are you polling the SNMP V2 mibs? It looks like the counter might be
wrapping before you sample the next time... just a thought, ...


-Billy
----- Original Message -----
From: "Perry, Duane" <PerryD at missouri.edu>
To: <mrtg at list.ee.ethz.ch>
Sent: Monday, April 22, 2002 3:26 PM
Subject: [mrtg] negative values?


>
>
> > We are using MRTG to track down the ever increasing amount of denial of
service attacks here.  Most of our port stats are collected using RRD.  The
attacks usually show up as 60Mb spikes on the graphs.  I noticed a number of
spikes today that had a lower case "m" for the scale.  I used rrdtool to
dump the data and found lines with negative values like this:
> >
> > <!-- 2002-04-22 -3:30:00 CDT / 1019464200 --> <row><v> 1.0819672131e-03
</v><v> 1.0819672131e-03 </v></row>
> > <!-- 2002-04-22 -3:35:00 CDT / 1019464500 --> <row><v> 3.2786885246e-03
</v><v> 3.2786885246e-03 </v></row>
> >
> > What does the loser case m stand for? Has anyone else ever seen this?
What could cause values like that?
> >
> > I have MaxBytes set to 12500000 with Options: bits
> >
> > Duane Perry
> > University of Missouri
> >
> >
>
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