fake traffic

Hello everyone,
I’ve been seeing this problem for a long time, by Acer 5635G.
The LAN card (Qualcomm Atheros AR8131 Gigabit Ethernet)generates traffic even when no cable is plugged in, and traffic is huge.
Can anyone suggest where to look for the problem?

I apply a screenshot of Network monitor widget.https://imgur.com/dD9LxLH

https://imgur.com/dD9LxLH

Hi
You would need to run something like wireshark or tcpdump to see what traffic is being generated.