See the "Linux" section of the "WLAN (IEEE 802.11) capture setup" page of the Wireshark Wiki for information on how to capture in monitor mode (OS vendors seem to go out of their way to make it difficult for an application to just say "please capture on this adapter in monitor mode", so libpcap's ability to do that is somewhat limited maybe someday I'll have time to make that better). If you're not capturing in monitor mode, you won't see unicast packets, such as streaming traffic, to or from that machine you'll only see broadcast traffic - such as ARP requests. That document will tell you how to attempt to decrypt the packets - and how to capture traffic so that it can be decrypted (to decrypt traffic to and from some other machine, your capture has to include the process of that machine associating with the network, so you may have to restart it, or disconnect it from the network and reconnect it, while Wireshark is capturing). In the Capture menu, you will need to select the USB option. Once Wireshark is installed, you can launch the program and click on the Capture menu. You can also start Wireshark by using the following command line: <ยข wireshark -i eth0 k> You can also use the shark fin button on the toolbar as a shortcut to initiate packet capturing.To capture USB traffic with Wireshark, you need to first install the Wireshark software on your computer. Choose the desired interface on which to listen and start the capture. Wireshark is a free open source packet analyzer that can be used to capture USB traffic. In the Wireshark menu, go to Capture Options. Your network is probably "protected" with some form of Wi-Fi Protected Access (WPA), which is a system for encrypting Wi-Fi packets to make it harder to sniff the network (yes, the fact that it's hard to use Wireshark to sniff Wi-Fi networks is a feature - of Wi-Fi). When running Wireshark, the first step is always to start a capture on a designated interface. If you're capturing in monitor mode, and you're seeing a lot of "802.11" packets being captured, first read the "How to Decrypt 802.11" page on the Wireshark Wiki (a helpful collection of resources).
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