[mrtg] Problems counting bytes through machine...

[Luciano Bernardes de Paula]

Hi!

I have to use mrtg to generate graphics showing the traffic that passes through 
a gateway. The idea is to have 1 graph to each IP that has as gateway this 
machine.

I wrote a simple rule using Iptables that counts the amount of bytes that goes 
or comes to or from each IP. The amount is catched at T1 for example, after X 
seconds, at T2 the amount is catched again, then the average is calculated 
((amount at T2 - amount at T1) / X) then I have the bytes/sec tax.

I pass this result to mrtg, but the graphic is not very well... A graph 
generated this way is looking different from other generated only by mrtg (by 
cat the /proc/net ...).

What is wrong? Don´t I have to calculate the average?

I tried to pass only the amount catched, without calculate the average, but it 
was worst...

Thank you!

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Luciano Bernardes de Paula - "Ruivo"
Grupo ACME!
Ibilce - UNESP - Rio Preto - SP - Brasil
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       ACME! Computer Security Research
         http://www.acmesecurity.org

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