![]() ![]() Install documentation is available from the doc/ directory in the distribution, but on a modern Linux system, MRTG will build without any special instructions. ![]() You will not need external SNMP software because MRTG comes with its own SNMP implementation. It relies on a few pieces of software not included in the distribution. In fact, MRTG can be configured to collect any statistical data that a device makes available via SNMP. In this way, you can monitor the bandwidth use of a particular machine. While MRTG is most often used to collect data from router interfaces, it can also collect traffic data from switches or servers. It will help you understand how traffic is distributed across your network, plan capacity needs for the future, and so on. ![]() When you are not tending to an immediate problem, MRTG is useful for studying trends in traffic on your network. A denial-of-service attack that attempts to exhaust the available bandwidth on a network nearly always presents as a sudden, sustained increase in traffic levels the attackers do not have much to gain by slowly ramping up the attack over a period of time. If a 100 Mbps link is carrying 85 Mbps of traffic, is this heavy but normal use or is the network straining under an attack? By having the history of the network available, you can look for sudden changes that might account for an operational problem. In practice, it can be difficult to tell from immediate bandwidth and packet-per-second counts alone whether a network is operating normally. The fact that the graphs display the history of the network is key. View the traffic patterns of many networks at once and quickly determine if one or more is experiencing an abnormal traffic load. In the middle of a crisis, or when you are debugging an immediate network problem, MRTG will allow you to. MRTG is the Multi Router Traffic Grapher, a piece of free software released under the GNU General Public License. ![]()
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