![]() ![]() But in case of debugging when the -w option is not used, this option may come in handy. You can skip it, because when using -w nothing will be displayed on the screen at all. -e – this option tells tcpdump to print MAC addresses.-w FILE.cap – file where the four way handshake will be saved.-I – this option tells tcpdump to set the interface into monitor mode, in this case this option is used to make tcpdump understand what we want to capture in monitor mode (we want to use IEEE802_11_RADIO link layer, but not EN10MB).-i INTERFACE – a wireless interface that we set into monitor mode and which we switched on a specific channel.Sudo tcpdump -i INTERFACE -I -w FILE.cap -e -U -c 4 'ether proto 0x888e and (wlan addr1 AP_BSSID or wlan addr1 CLIENT_BSSID)' ![]() Now you need to run a command of the form: ![]() Therefore, you must either stop the NetworkManager service: ![]() Keep in mind that NetworkManager and other programs can automatically switch wireless interfaces to other channels. To achieve this goal, you need to start by switching the wireless card to the desired channel. To capture, I will use a wireless interface named wlp0s20f0u1. Let’s consider the practical situation: you need to capture a handshake from the access point with BSSID 14:9d:09:d0:04:84, which works on channel 8. The previous command will capture handshakes on the channel on which wireless adapter is currently operating – there will be no automatic channel switching. Sudo tcpdump -i wlp0s20f0u1 -I -w test.cap -e -U ether proto 0x888e When capturing handshakes, it is recommended that you always specify the -U option, so that data is immediately written to a file.Īn example of capturing all handshakes (for any Access Points and clients) and saving them to the test.cap file: In order for tcpdump to filter only handshake frames, use a filter: See the Wireshark Filters article for more details. Subsequently, this handshake can be found using Wireshark using a filter: When tcpdump is running in monitor mode without specifying filters, all wireless frames, including a four-way handshake, will be captured. ![]()
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