Published at LXer:

Getting network stats on a Linux machine is not particularly difficult. With tools like sar, Iperf, and vnStat available for nearly every distribution, command-line aficionados can get the low-down on their network with just a few useful commands. Take, for instance, vnStat, a popular network traffic logger. vnStat is different from a network sniffer like Wireshark since it polls the network interface stats going to and from the kernel. Wireshark, on the other hand, actually monitors packets coming in and out of your machine.

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