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Favorite Monitoring Tools
Scrutinizer, Ravica and MRTG.
Scrutinizer is a network monitoring tool that allows users to analyze network traffic using NetFlow and sFlow. Scrutinizer diagnoses traffic congestion by displaying which hosts are using the most bandwidth and what applications they are using.
Graph details about your network devices using MRTG and SNMP. Tobi Oetiker's Multi Router Traffic Grapher is written in perl and works on Unix/Linux, as well as Windows and even Netware systems.