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Dear friend click your wireless interface. You can configure advanced features by clicking Capture Options,As soon as you click the interface’s name, you’ll see the packets start to appear in real time.Wireshark captures each packet sent to or from your system. If you’re capturing on a wireless interface and have promiscuous mode enabled in your capture options, you’ll also see other the other packets on the network.You’ll probably see packets highlighted in green, blue, and black. Wireshark uses colors to help you identify the types of traffic at a glance. By default, green is TCP traffic, dark blue is DNS traffic, light blue is UDP traffic, and black identifies TCP packets with problems — for example, they could have been delivered out-of-order.
https://ask.wireshark.org/questions/16273/how-to-capture-wi-fi-traffic-from-another-machine
