Finally, make install installs MRTG and its associated files in the appropriate places.Again, don't bother running make install if the previous make command terminated with errors.In a larger network, other people (e.g., other network staff or management) may need to access the reports; to allow access without publishing your network statistics to the rest of the world, you may want to set up some kind of a secure web server.
Although its graphing capabilities make it look superficially like an NMS, it's really a simple polling engine that's very clever about the output it generates.
It performs the same get functions that an NMS would, but its job isn't problem detection and resolution.
It doesn't have a facility for generating alarms or processing traps, nor does it have the ability to set objects.
It's simply designed to provide a graphical view of how your network is performing.
If you're interested in an open source NMS package, you should investigate Bluebird (
Before using MRTG, you have to download and install the software. The download link takes you to a directory maintained by MRTG's inventor and primary developer, Tobias Oetiker ( ).
Although MRTG is best at displaying usage graphs for router interfaces, it can be configured to graph things like memory usage, load average, and disk usage on server equipment.
MRTG is particularly useful for determining when something "peaks out" for an extended period of time, which indicates that you have a capacity problem and need to upgrade.
If you get some sort of "command not found" error, Perl may not be installed.
In any event, go to to get the latest version of Perl.
For example, you might find that your T1 interface is maxed out during your peak business hours and you need to upgrade to a bigger circuit, or you might find that you need to add more memory to a server.