[mrtg] Re: MaxBytes

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Mon Sep 3 19:37:30 MEST 2001

```WEYMIENS Bruno FTRD/DMI/SOP wrote:

> ok, I tried to put MaxBytes = 200, but in that case, the red line is put at
> 200, not 2000, and every value > 200 is ignored, which happens often because
> "value" is multiplied by 10 !

and

> so I someone can explain to me which error I did...
> is it because the value is multiplied by 10 (ie in the MIB, the value is 256
> < 2000, then multiplied by 10 = 2560 > 2000) ?

> What I'd like to have, is a kind of threshold equal to 2000, compared to a
> value computed from 2 MIB OIDs (x * 10) ; and if the result is > 2000, then
> ignore it.

I don't get it.

Am I right in assuming that the values you wish to allow are
upto 2000 *before* being multiplied by 10 ?

You write that if you set MaxBytes to 200, every value above 200 is
ignored.  You also write (sort of) that you want to allow original
values of 256 (which become 2560 when multiplied by 10).

However, if you set MaxBytes to 2000 then an original value of 256
is already ignored. So, obviously, MRTG checks the value after it
has been multiplied by 10.

If you want to allow the 256 value and if MRTG does indeed check
MaxBytes after multiplying by 10, MaxBytes should at least be 2560.
On the other hand, you write that you want to compare (x * 10) to 2000.
This indicates to me that you want to ignore any value of x which is
above 200 (so: 256 is wrong).

Now you have to find out where you misinterpreted the evidence.

It is highly unlikely that MRTG compares the input 'x' to MaxBytes
when you have a MaxBytes of 200 and compares the input 'x * 10' to
MaxBytes when MaxBytes is 2000.

It will either compare 'x' to MaxBytes in both cases, or it will
compare 'x*10' to MaxBytes in both cases.

So, make up your mind.  Clearly describe for yourself what you want
to do.  Rebuild, from scratch, the mrtg config file.  If it fails,
clearly describe the problem.

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