thanks for the passive monitoring link.
I have tried wireshark to capture and monitor my LAN traffic.
but based on the other reference, it is useless,
because, NSA-tier backdoor has independent internet access,
independent of the OS and firewall,
so we could not use wireshark to capture its traffic.
besides, from my experience,
i also have old laptop, with Intel dual core,
I had unplugged its wifi card, so logically it has no internet access,
but still the same, anything I do inside are leaked out.
It means, this backdoor has a totally independent internet access,
also we don’t know, it is connected to which router / modem, or maybe satellite,
since nowadays, we are surrounded by many hot spot wifi / router,
or maybe it is connected via bluetooth, or maybe ultrasonic receiver transmitter.
p.s. remember, all my evidence here, are common sense evidence only,
so, could not be used to judge / blame / define anything,
but me myself has strong confident on these evidence.