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The second technique, which is used primarily by smartphones, involves periodically broadcasting packets called Probe Requests, which contain the unique MAC address of the client and (sometimes) the name of a network to which it has previously connected. The first technique, which is used by laptops and most non-smartphone devices, involves scanning for Beacon Frames (packets broadcast by WiFi routers in order to advertise their presence), waiting for a network that the client has previously connected to, and initiating a connection with it. When a WiFi client (phone, laptop, etc) is looking to connect to a known network, there are two approaches it can take. Your mileage may vary don’t try this at home etc, etc. I will state that I am by no means an expert on wireless networks, signal analysis, or anything of the sort, but I have conducted a fair bit of research and trial and error, and it works for me.
#Installing scapy on openwrt how to#
Having built a similar system for my project, Casual Encounters, I think I can explain some of the inner workings of these systems, how to avoid being tracked, and how, for research purposes or to determine their own level of exposure, someone could build such a system. Most of these articles focus on the significant privacy and security concerns associated with this practice, but few of them get into the details of how the technology works. In the last year or so, there have been quite a few stories on the use of passive WiFi tracking by advertisers, retailers, and analytics startups.