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Open Source Network Administration by James Kretchmar

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Chapter 3. MRTG

Overview of MRTG

MRTG is the Multi Router Traffic Grapher, a piece of free software released under the GNU General Public License.[1] It was written primarily by Tobias Oetiker and Dave Rand. MRTG produces Web pages that display graphs of bandwidth use on network links on daily, weekly, monthly, and yearly scales. This can be an invaluable tool for diagnosing network problems because it not only indicates the current status of the network but also lets you visually compare this with the history of network utilization.

MRTG relies on SNMP version one, and optionally SNMP version two, to obtain data from routers or other network hardware. Using the variables described in Chapter 1, MRTG sends SNMP requests every five minutes and stores ...

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