We have 2 VM servers at CCC.co.il for 3 months now. It still in development phase, so no clients use these servers. We have 20GB monthly traffic included in price. 2 first months we did not overuse the traffic, but in October we received 700GB over-usage charge. CCC uses VMWare Chargeback system for counting traffic, and this system cannot tell what was in these 700GB! If I look at NIC interfaces inside the VMs, I hardly count 4.5GB traffic for 2 months.
Does anybody knows reliable software for counting all traffic, free preferrably? So, I can install it on my servers to watch what is going on. All network monitors I tried capture traffic, but I have to see the byte COUNT.