[mrtg] What default OIDs are used by MRTG?

PAUL WILLIAMSON pwilliamson at mtb.com
Tue Mar 18 14:10:24 CET 2008

>>> "James Geiger" <jpgeiger at gmail.com> 3/17/2008 8:42 PM >>>
> With the in and out octets, does anyone know the magic (formula) 
> that MRTG uses to convert it to a number that makes sense?  When 
> I do an snmpget on any particular device for those two OIDs it returns 
> some crazy number up in the billions.  MRTG converts it to something 
> (for example) like 2MB/s or what have you.  Is the formula also done 
> in perl or are there other internal conversion scripts to make it so its 
> readable by your average human? 
Yes, the maginc formula is Delta/300.  The OIDs returned are typically 
just the number of octets that have passed through the interface since:
a) the counter rolled over or, 
b) the device(or snmp stack) was started
Figuring that part out is really not that complicated.  It's all the 
other stuff (like rollover detection and normalization) that 
make MRTG such a powerful tool.

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