![]() After adding the entries for time deltas for Min/Max/Avg beacons, I also added a display filter for QoS Data to show when traffic was being transmitted. The default graph is for All Packets, but you modify this with a display filter and then add Y-axis filters if needed. ![]() ![]() Going to Wireshark – Statistics – IO Graphs brings up the IO Graphs window. I started building a graph for beacon intervals. In the Wireshark capture, I can filter on beacons by using wlan.fc.type_subtype=0x0008 and see the time delta from the previous displayed frame as 0.1025 seconds then 0.1023 seconds then 0.1024 seconds and so on which makes sense…but a graph would be much better to visualize what is happening. But, this is more accurately described in the CWNP article: The wifi beacon from the AP is configurable and the default is usually around 100ms. ![]() Here is my attempt to take a wifi capture file and use the IO Graph feature in Wireshark to measure the beacon interval as well as see how beacons behave with wifi traffic. ![]()
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