[mrtg] Re: MRTG or SNMP Oddity [MRTG Problem]

[Holt Grendal]

One final reply to myself from myself:

I have further narrowed down this problem to rateup. MRTG
is passing the correct values to rateup and rateup is somehow
mangling up the data.

I'm going to setup a second mrtg to use rrdtool and run
that one along with the old one using rateup simulataneously
and see what happens.

I'd love to hear from the author about this, especially
if I can provide more information to help solve the
problem. I could be running into limitations of rateup
aswell.

Thanks,

Holt



--- Holt Grendal <holtor at yahoo.com> wrote:
> 
> I have certaintly narrowed this down to a mrtg problem.
> 
> Looking at my data below. You take the snmp value subtracted
> from the previous value, then divided by 300 to get the log
> file value. Then you take that value and multiply it by 8 and
> divide by 1024 to get a value in kbps.
> 
> Incomming: (1722929411 – 441520471) / 300 = 4271363
> Outgoing: (64825171 – 58990350) / 300 = 19449
> 
> 4271363 = ~33,370 kbps = 33.37 mbps
> 19449 = ~151 kbps
> 
> Now those values are correct values as printed from SNMP but
> mrtg logged these values:
> 
> 1043683203 12194264 19449 12194264 19449
> 
> The 19449 is correct but the 12194264 clearly should have
> been 4271363
> 
> The 12194264 is a larger value because acctually I hand modified
> this after the fact. Irregardless mrtg is not doing the math, and
> printing the proper value to the log file.
> 
> Any ideas?
> 
> Thank you!
> 
> Holt.
> 
> --- Holt Grendal <holtor at yahoo.com> wrote:
> > 
> > 
> > Hello all,
> > 
> > I still have this problem and apparently my reply message 
> > several days ago got rejectred due to too much quoting. Since
> > then I've gathered some more information and it looks like this
> > in an MRTG problem if you read my original post below.
> > 
> > FYI: In my .cfg i have Options: bits
> > I turned on debugging when one of these DoS attacks was going
> > on and here is the data I collected:
> > 
> > From mrtg debug:
> > --base: Get Current values: 441520471, 58990350, 8 days, 5:50:19, switch-name, 1043682903)
> > 
> > What actually printed in the .log file for the interface:
> > 1043682903 12194264 14227 12194264 14227
> > 
> > From mrtg debug (5 mins after the above one):
> > --base: Get Current values: 1722929411, 64825171, 8 days, 5:55:19, switch-name, 1043683203)
> > 
> > What actually printed in the .log file for the interface:
> > 1043683203 12194264 19449 12194264 19449
> > 
> > 
> > Those numbers captured from snmp and the numbers printed
> > in the *.log by mrtg do not match. I'm not sure what the units
> > are but whatevere they are you can clearly see the snmp values
> > changing while the ones printed in the mrtg log do not change.


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