What commercial or open-source tools are available to measure bandwidth utilization on a network? The tools should provide current and historical snapshots.
closed as off-topic by HopelessN00b, dawud, Katherine Villyard, Rex, mdpc Feb 23 at 4:37
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For monitoring, I would say something like Cacti, Ganglia or Munin. And for alerts, I would use Nagios.
For spot monitoring, ntop is useful for a quick graphical overview. One could always use netstat or tcpdump if you are into the command line stuff.