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You can use sensors with WiFi Explorer Pro 3 and Airtool 2 to scan Wi-Fi networks and do packet captures remotely. 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.
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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. We will assume you have a fresh installed Raspberry Pi 4 using Raspberry Pi OS.
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. Monitor mode lets us “sniff” Wi-Fi traffic, which we need for Wi-Fi scanning and packet captures. Many external adapters support monitor mode. For this blog post, we will be using the Comfast CF-912AC USB Wi-Fi adapter.
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Update (2021-03-08): 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). 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.
Prepare the Raspberry Pi
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. 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.
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To set the country, run raspi-config.
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Choose Localisation Options > WLAN Country, and select the country in which you’re located.
Then, you need to install a few dependencies and tools that are required to build the wireless drivers for the Comfast CF-912AC adapter:
Build and install the wireless drivers
After the Raspberry Pi 4 restarts, you can proceed to build and install the wireless drivers. We will use aircrack-ng’s fork of the original RTL8812AU drivers that enables monitor mode:
Once you finish installing the driver, attach the external adapter to the Raspberry Pi 4 and confirm a new Wi-Fi interface is available, e.g., wlan1:
Configure the Raspberry Pi 4 as a remote sensor
At this point, you can already use the Raspberry Pi 4 as a remote sensor in Airtool 2. To learn more about doing remote packet captures, see Capture using a remote sensor. To use the Raspberry Pi 4 as a remote sensor in WiFi Explorer Pro 3, you need a few more steps.
First, you need to install some package dependencies:
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Then, install the wifiexplorer-sensor script, which enables the remote Wi-Fi scanning functionality using WiFi Explorer Pro 3. Verify the interface name of the external adapter, e.g., wlan1. If it’s different than wlan1, then replace wlan1 below with the actual interface name.
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The Raspberry Pi 4 is now ready to be used as a remote sensor in WiFi Explorer Pro 3. To learn more about remote sensors and WiFi Explorer Pro 3, see Connect to a remote sensor.
Conclusion
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To use a Raspberry Pi 4 as a remote sensor in WiFi Explorer Pro 3 and Airtool 2, you need a compatible Wi-Fi adapter that supports monitor mode and to install the wifiexplorer-sensor script. In this blog, we have described how to configure a Raspberry Pi 4 as a remote sensor using the Comfast CF-912AC USB Wi-Fi adapter.