Comment 6 for bug 798649

Ok, the interface is not used as it is an interface without a device link in sysfs (/sys/class/net/*/device).

This prevents the traffic on vpn connections to show up twice, but also ignores the traffic on the umts stick.

Maybe there is a way to distinguish both, as my real devices link to /sys/devices/pci... and all the virtual ones to /sys/devices/virtual...

Could you attach the output of "ls -lR /sys | gzip > /tmp/sysfs.gz" and "ifconfig"?