Flag virtual network interfaces
Given that virtual network interfaces (tun, veth, etc.) in some cases need to be handled separately/differently (e.g. by not including them into network totals for computer because they cause the multiplied real traffic to be shown) it would be great if each network interface would have a type or at least a flag to show that it is a virtual one (see gnome-system-monitor#218 (moved) for discussions or gnome-system-monitor#73 for another issue).