I have setup MRTG for my router and I have create new target by adding all network interfaces together (lets call it Total_traffic).
I'm trying to create a new target which give total traffic expect one network interface. To do this can I subtract that particular interface from Total_traffic target?
I tried use -
but didn't work.
Any advice helpful, Thank you!
MRTG configuration does not allow you to define a Target as a function of another Target (the Routers2 frontend does allow you to display multiple Targets on one graph, or totalled, but not as more complex functions).
Instead, you need to define a new Target that makes the function you want. Make sure to surround each token with spaces.
EG:
Target[foo]: 1:comm@rtr + 2:comm@rtr + 3:comm@rtr
Target[bar]: 2:comm@rtr + 3:comm@rtr
The MRTG manual is online here; you can see the definition of the more advanced Target syntax lower down.