Npcap is based on WinPcap project which is currently not actively developed. Npcap is created and developed as a Nmap project. Take a look at the FAQ section under this in the guide, it has additional info.Npcap is packet capture library for Windows operating system. Stop the capture in Wireshark UI when you finishes capturing, the monitor mode will be turned off automatically by Npcap. To decrypt encrypted 802.11 data packets, you need to specify the decipher key in Wireshark, otherwise you will only see 802.11 data packets. You can use the WlanHelper tool to double-check this fact. If you see a horizontal line instead of the checkbox, then it probably means that your adapter doesn't support monitor mode. Then toggle the checkbox in the “Monitor Mode” column of your wireless adapter's row. Launch Wireshark QT UI (GTK version is similar), go to “Capture options”. Install latest version Wireshark and latest version Npcap with Support raw 802.11 traffic option checked. So when you turn on monitor mode outside Wireshark (like in WlanHelper), Wireshark will not know the adapter has been in monitor mode, and will still try to capture in Ethernet mode, which will get no traffic. This is because Wireshark only recognizes the monitor mode set by itself. If you want to use Wireshark to capture raw 802.11 traffic in “Monitor Mode”, you need to switch on the monitor mode inside the Wireshark UI instead of using the section called “WlanHelper”. The latest Wireshark has already integrated the support for Npcap's “Monitor Mode” capture. How to use Wireshark to capture raw 802.11 traffic in “Monitor Mode” Of note, this section seems most relevant: Since Npcap is a 3rd party tool, there may be some good resources in the user guide for that software itself:
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