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* http://en.wikipedia.org/wiki/Comparison_of_network_monitoring_systems * http://www.slac.stanford.edu/xorg/nmtf/nmtf-tools.html * http://www.topology.org/comms/netmon.html * http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch22_:_Monitoring_Server_Performance * http://www.debianhelp.co.uk/snmp.htm * http://www.debuntu.org/how-to-monitor-your-servers-with-snmp-and-cacti * http://www.debianadmin.com/linux-snmp-oids-for-cpumemory-and-disk-statistics.html * http://www.nagios.org/ * http://oss.oetiker.ch/mrtg/