Bandwidth Usage on a linux Box

[Jatin Davey]

Hi

I want to monitor the bandwidth usage on my linux box using nagios. I 
checked the already existing plugins that i downloaded. I found that the 
plugin named as : "check_mrtgtraf" can be used to achieve this 
functionality. When i read through its help page i sensed that it reads 
these values from a file on the target machine which i want to monitor. 
I have no prior experience working with MRTG.

Can some one throw some more light on how this plugin is used ?

What is the log file that it reads that data from the target machine 
being monitored ?

What do i need to do as a pre-requisite to use this plugin on the target 
machine ?

Is there any other way like say via SNMP that i can achieve the similar 
functonality ?

Appreciate your responses.

Thanks
Jatin

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