![]() ![]() I have recently come into a handful of Raspberry Pi 3A+ units, and I’ve hit a bit of a roadblock on using them the same way as the Pi 4. Otherwise, rfkill, a process that the system uses to enable and disable wireless devices, will prevent you from using any wireless adapter until you set the region that determines the wireless adapter’s operation rules. If you haven’t done it already, the first thing you need to do is set the country where the Raspberry Pi 4 is being used. A better adapter option is the MediaTek MT7612U, which has the same capabilities as the CF-912AC but is more stable and works out-of-the-box in the latest Raspberry OS version. Update (): We have observed, as well as other users using other platforms such as the WLAN Pi, that the Comfast CF-912 AC USB adapter might not be capturing all 802.11ac data frames ( click here to read more about it ). For this blog post, we will be using the Comfast CF-912AC USB Wi-Fi adapter. Many external adapters support monitor mode. Monitor mode lets us “sniff” Wi-Fi traffic, which we need for Wi-Fi scanning and packet captures. The Raspberry Pi 4 comes with an onboard Wi-Fi adapter, but we will use an external adapter instead because the onboard Wi-Fi adapter doesn’t support monitor mode out of the box. We will assume you have a fresh installed Raspberry Pi 4 using Raspberry Pi OS. This blog post will show you how to configure a Raspberry Pi 4 with an external Wi-Fi adapter to be used as a remote sensor in WiFi Explorer Pro and Airtool. A sensor can be any Linux device with a compatible Wi-Fi adapter configured with the necessary packages to enable remote Wi-Fi scanning and packet capture capabilities. ![]() You can use sensors with WiFi Explorer Pro 3 and Airtool 2 to scan Wi-Fi networks and do packet captures remotely.
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