[mrtg] Re: Substract values?

[Alex van den Bogaerdt]

c.w.vandervelden at kpn.com wrote:
> > 
> > Is it possible to substract values (doesn't look like it)? So what I 
> > want to do is something like this:
> > 
> > target[x]: 3:public at router1 + 3:public at router2 - 3:public at router3
> > 
> > This way you could calculate the remaining traffic to router 4 (this 
> > one does not support the correct SNMP settings) eg.

Yes, with a restriction.  You need to make sure the outcome isn't
negative.  Do this by swapping in and out traffic where necessary.
You need to do this anyway or else you're subtracting the wrong numbers.

Check the top few lines of your log files:

This is working:
   ==> test1.log <==
   970749392 7034756386 1311657595
   970749392 13741 17374 13741 17374
   970749381 1277 2090 11496 18815
   970749300 0 0 0 0
   970749000 0 0 0 0

This isn't:
   ==> test2.log <==
   970749392 -1505068834 -358800532
   970749392 0 0 0 0
   970749381 0 0 0 0
   970749300 0 0 0 0
   970749000 0 0 0 0


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