[mrtg] Re: not seeing errors

[Bjorn Nordbo]

Roth, Gabrielle wrote:
> 
> Have you tried:
> 1. doing a few of snmpgets against those interfaces (maybe three, during the
> time you think you're getting errors) for ifInErrors and ifOutErrors, and
> making sure the counter is actually incrementing--if it's not, no errors
> 2.  if it is, how much is it incrementing?  You may not be getting enough
> data for mrtg to notice:  mrtg takes the delta (amount of change) between
> the current value and the previous value, and divides that by the number of
> seconds between polling periods.  If you are running mrtg at the default 5
> minutes, this is 300 seconds.  You have to have a delta of more than 300 for
> traffic to register on mrtg.  If your traffic is really low, it won't show
> up.  If this is your problem, look at the 'perminute' and 'perhour' options.

I you use the rrdtool backend, it will log decimal values. Still, I
think graphs are quite useless for this, one shoul probably use some
tool to analyze the data and only use the graphs for further analysis.
But of course your mileage may vary..

-- 
Bjørn Nordbø  -  IP Development  -  Nextra Norway

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