On what OSI model layer does DU Meter operate?

Overview

DU Meter does its traffic volume calculations on the IP layer (IP headers and anything above them are included, anything below them isn't). IP is OSI layer 3. This is consistent with how most other software operates and it's what is expected by most users (ISP traffic accounting works on IP level for example).

Network Adapter Selection

It is very important to select correct network adapters in DU Meter, especially when you have a multi-homed system or when virtual network adapters exist. Otherwise VPN traffic could be calculated twice—first on the VPN interface and then a second time encapsulated on the real interface.

Why Totals May Differ

Networks are always lossy to some extent, so when measuring on two points you will never get exactly the same byte counts: some traffic is lost due to physical errors, some is dropped by intermediate switches, routers and firewalls. However, our methodology is sound and agrees with generally accepted practices used by other reputable traffic accounting software vendors.

Common issues