A co-worker today introduced me to ‘iftop’ which is an incredibly handy utility forÂ monitoring current bandwidth utilization through an interface.Â Its sortof like a simple, command-line version of ntop. It is available in most Debian repositories, and in the RPMForge repositry if you use RHEL/CentOS.Â More information on its homepage at http://www.ex-parrot.com/~pdw/iftop/
Also, another handy bandwidth monitoring program to run on your server is vnstat.Â It runs via cron every 5 minutes andÂ can provide some simple historic bandwidth usage graphs.Â I didn’t see any packages for vnstat, but its the simplest build I’ve ever seen.Â Just download it and run ‘make && make install’Â More information at http://humdi.net/vnstat/
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You may be interested in pmGraph, which we just released as open source (http://pmgraph.sourceforge.net). If you try it, please let us know how you get on and how we can improve it.