I have a CentOS 5.7 box configured as a router. Two network cards are attached to this machine, one connected to the Internet and one connected to an unmanaged network switch.

The question is, how can I monitor bandwidth usage per IP address routed through this machine. I know how to monitor instant traffic and ports, I want to monitor the -- for example daily, monthly traffic.

any help is appreciated.


migrated from stackoverflow.com Feb 5 '12 at 12:22

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NTOP should be able to give you these statistics, as well as a nice per-protocol breakdown. If your router doesn't have a lot of memory or processing, I would recommend looking into mirroring the traffic to another machine and running NTOP on there.

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