[mrtg] Substract values?

[c.w.vandervelden at kpn.com]

> Hello All,
> 
> 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.
> 
> ANybody a clue?
> 
> Greetings,
>      Karel van der Velden
> 

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