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Date:      Sun, 15 Jun 2008 19:42:00 +0200
From:      Hartmut Brandt <hartmut.brandt@dlr.de>
To:        Olivier Mueller <om-lists-bsd@omx.ch>
Cc:        freebsd-net@FreeBSD.org, freebsd-questions@freebsd.org
Subject:   Re: mrtg peak on reboot / snmp-issue?
Message-ID:  <48555468.9090203@dlr.de>
In-Reply-To: <1213546323.29846.24.camel@bigapple.omnis.ch>
References:  <1213546323.29846.24.camel@bigapple.omnis.ch>

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Olivier Mueller wrote:
> Hello,
> 
> Small but curious thing on my freebsd-based systems: when a
> server is rebooted, it generates a peak (or "spike"?) on the
> network mrtg for all interfaces (here just before 1 am): 
> http://8304.ch/om/stuff/mrtg_localhost_1-day.png

This could happen if either the daemon fails to correctly provide 
ifCounterDiscontinuityTime or mrtg fails to correctly interpret 
sysUpTime and/or ifCounterDiscontinuityTime.

> It happens with both net-snmp and ucd-snmp, with a quite standard 
> mrtg installation (generated by cfgmaker). 
> 
> Do you have the same "issue" on your own servers?  All I can add, is
> that there is not such a high traffic after a reboot, and that it
> doesn't happen on similar linux-based systems.


harti



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