Bandwidth monitoring with vnStat
If you want to monitor and manage your Internet bandwidth, perhaps to make sure your ISP is not overbilling you, try vnStat, an open source, Linux-based application that gives you a clear picture of your bandwidth usage. This command-line application is simple to install and easy to use.
VnStat offers binary packages for the Debian distribution on its site, and Dag Wieers' RPM repository has RPMs for various Red Hat-based distributions.
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