[mrtg] Re: Sum of 'In' and 'Out'

[Alex van den Bogaerdt]

Jeff Karp wrote:
> 
> FYI - Novice MRTG user.

FYI - novice users visit 
    Archive   http://www.ee.ethz.ch/~slist/mrtg
    FAQ       http://faq.mrtg.org
    Homepage  http://www.mrtg.org
as found below every post.  Yes, this is time consuming.

> Is there a way that the "In" and "Out" traffic on a graph can be added
> together and then displayed as a separate line on the same graph ?

MRTG plots two datasources.  If you want, you can add In and Out
together and plot that; this is just the same as plotting traffic
from router A and router B.  You cannot plot three datasources on
one graph, the sum would be the third.

Adding In,Out to Out,In would result in a usable graph but you cannot
combine this with only In and only Out.  If you really *must* do this,
have a look at RRDtool but be aware that you will have to create a
custom made grapher script (which is not too hard to do IMHO).

HTH
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