Does the Raspberry Pi 4 chip set allow monitor mode?

Question

I tried to run the command to test if my device supports monitor mode,

airmon-ng start wlan-0

and this is the error is received,

ERROR adding monitor mode interface: command failed: Operation not supported (-95)

Apparently, I am using a Raspberry Pi 4 model B for network scanning, but it does not support monitor mode for this to happen. Can anyone suggest me a way to have this mode on my device.

Answer 1

If you look at the chip configuration on the RasPi with:

rpi ~$ iw list
Wiphy phy0
--- snip ---
    Supported interface modes:
             * IBSS
             * managed
             * AP
             * P2P-client
             * P2P-GO
             * P2P-device
--- snap ---

There is no monitor mode available, so you are out of luck with sniffing WiFi networks with a Raspberry Pi. There is a project nexmon on github that patches the WiFi firmware to make the monitor mode available. Seems not to be an easy task but you may have a look at it.

For some additional information you can also look at Enable monitor mode.

You may consider to purchase an additional USB/WiFi dongle that supports monitor mode.

Answer 2

I ran the aircrack program with my Raspberry Pi 4 8 gig approximately 1 week ago. I had no issues setting the internal WiFi interface into monitor mode.

Then again I was running Kali on the pi hardware. Although that shouldn't matter I don't think.

Answer 3

I have attached a PAU09, from Amazon, that does a fine monitoring

Answer 4

I got the wireless card in my Raspberry Pi 4B into monitor mode by running these commands:

sudo ip link set wlan0 down && \
sudo iw wlan0 set monitor control && \
sudo ip link set wlan0 up