[mrtg] multi-target graphs problems

[John Latimer]

Hello to all,

I need some help with MRTG.

I'm monitoring four high speed interfaces and I want to measure the
Aggregate of 2 x firewall external interfaces minus aggregate of 2 x 
firewall internal, like so:-

[target]: 1:public at 192.168.0.1 + 2:public at 192.168.0.1 - 
3:public at 192.168.0.1 + 4:public at 192.168.0.1

However the graph should be flat (or close to flat) but what I'm actually 
getting is (1+2) (3+4), not (1+2)-(3+4) effectively double the internal and 
external graphs, anyone have any ideas?

Regards.

John

System: Sun Blade 100
Mrtg: version 2.9.25
Cisco : cat6509, runing IOS (not native)
HP : hp5300  

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