[mrtg] Re: Math

[Alex van den Bogaerdt]

Daniel R . Kilbourne wrote:
> 
> On Fri, Feb 11, 2000 at 02:03:19PM -0500, Bryan Socha wrote:
> > Is it just me or does subtracting interfaces/oid not work?  Addition is
> > excellent but does anyone know anything about this?
> > 
> 
> Well, I've never tried it, but you could always add the inverse
> 

Nope, the inverse would be adding "-1:public at device" which is, for MRTG,
the same as swapping in and out for interface 1 and adding that to the
other interface.  This means that a simple sum like:
   "2:public at device + -1:public at device"
may verywell be the same as adding interface 1 output to interface 2
input and vice versa.

Perhaps the following will subtract: (mind the spaces around the '-')
   "2:public at device - 1:public at device"
(never tried it but if I would like to try it, this is how I would go).

If anything else fails, you can always use the external program interface
and do it yourself.

Another option would be to use rrdtool.

regards,
-- 
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 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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