I am running Kali Linux (2020.1b 64bit) via VirtualBox (6.1) on a macOS host (10.15.4) with a brand new Alfa AWUS036NH network card attached via USB.
The network card is recognised by Kali Linux and is set to monitoring mode:
$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11 Mode:Monitor Frequency:2.427 GHz Tx-Power=20 dBm Retry short long limit:2 RTS thr:off Fragment thr:off Power Management:off
However, when running
airodump-ng wlan0, no wireless networks are discovered despite there being numerous.
I have noticed that by physically removing the adapter and re-plugging it back into the USB port, I am able to get the card to discover the nearby networks. This does not always work, but it is the only scenario that I am able to get it working. Furthermore, whenever I get it “working”, this state is short-lived and the networks disappear within a few minutes — and then silence.
What could be causing this unusual behaviour and what diagnostic tests can I run to narrow down the cause?