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If wifi/wlan is broadcast medium, can we tap the wifi traffic by just placing our wlan0 into promiscuous mode?. In this way, can we get the source ip and destination ip of the traffic generated by other laptops with or without connecting to AP?

If Wifi is not a broadcast medium, why it is not? I mean, the router or laptop sending/receiving the singles into/from free space. I answered to this question: that software is showing only beacons I think!

How wifi works internally and detects the collision?

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If wifi/wlan is broadcast medium, can we tap the wifi traffic by just placing our wlan0 into promiscuous mode?.

Yes, it is a broadcast medium, in the sense that only one transmitter can be on at a time, and yes, you can sniff Wi-Fi traffic. The one thing to be aware of is that many Wi-Fi adapter drivers, especially for Windows, can not switch to promiscuous mode.

How wifi works internally and detects the collision?

Wi-Fi uses CSMA/CA, which is different than Ethernet. It attemps to avoid collisions from happening. This question explains in more detail.

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