As you people may already know, /proc/net/dev can tell you how many data your interface has send and received, but there is somekind of problem.

Every time I check my information (let say with phpMyInfo) the numbers aren't correct, for example.

It tells me I sended in 3 days 1.01GB with eth0. That isn't true, cause I'm 100% sure, I sended yesterday evening + this morning more then 1.6GB.

When is this file getting to zer0?
Every night? On somekind of time?
Or when the interface gets down? (Btw, my didn't get down in those 3 days)
Or is there somekind of limit, where it starts from zer0 again?

Greetz,
AliTriX