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I was wondering how are the network interface statistics generated? Could someone point me out?

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up vote 1 down vote accepted

The operating system kernel has to handle every network packet that flows in and out of the system and so it is a simple matter for the kernel to maintain counters and provide an API for other programs to display the statistics the kernel maintains.

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yes and for example if i have now out traffic 80GiB then it is the overall traffic from the system installation or the traffic measured from the last reboot? – rsz Jan 7 '13 at 22:51
@rsz Since last reboot almost certainly for Unix-ish systems. I have no idea about Windows. – Kyle Jones Jan 7 '13 at 23:10
thanks for the information – rsz Jan 8 '13 at 8:12

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