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Added info to use an USB/WiFi dongle with monitor mode
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Sniffing other WiFi networks you are not associated must be supported by the WiFi chip, called monitor mode. 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.

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

Sniffing other WiFi networks you are not associated must be supported by the WiFi chip, called monitor mode. 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.

Sniffing other WiFi networks you are not associated must be supported by the WiFi chip, called monitor mode. 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.

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

Source Link
Ingo
Ingo
  • 42.6k
  • 20
  • 85
  • 205

Sniffing other WiFi networks you are not associated must be supported by the WiFi chip, called monitor mode. 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.