Brotli decompression support in HTTP/HTTP2 (requires the brotli library).Dark mode support on macOS and dark theme support on other platforms has been improved.You can drag and drop a column entry to the display filter to create a filter for it.Previous installers shipped with Qt 5.12.4. The Wireshark 3.1.0 Windows installers ship with Qt 5.12.6.Allow extcaps to be loaded from the personal configuration directory.Action buttons for the display filter bar can be aligned.IOGraph automatically adds a graph for the selected display filter if no previous graph exists.The Windows packages are now built using Microsoft Visual Studio 2019.This feature went missing around 2009 or so. You can once again mark and unmark packets using the middle mouse button.You can now follow HTTP/2 and QUIC streams.You can now select multiple packets in the packet list at the same time using “Ctrl+C” or “Cmd+C” options.Automatic updates are supported on macOS.For mac now it ships with Qt 5.12.6(GUI for Wireshark). Installers for Windows, macOS, and source code are now available. | Col 1: AVG(frame.time_delta_displayed)frame.It is a free and open-source packet analyzer and it runs on various operating systems that include Microsoft Windows, Linux, macOS, BSD, Solaris, and some other Unix-like operating systems. z io,stat,0.01,”AVG(frame.time_delta_displayed)frame.time_delta_displayed” \ Another cool trick is that you can also measure the beacon interval with this tshark command: tshark -r wifi-capture.pcap -q -Y wlan.fc.type_subtype=0x0008 \ Now with the original goal accomplished, measuring the beacon interval, this post also reveals that beacon intervals can change as air time becomes limited. Zooming in further shows how closely yet separate the beacons are from the data traffic. When traffic starts, the beacon intervals are scattered among the traffic carrying frames because now there is more contention for air time. There is a big gap at 10.24 seconds where the beacon was delayed for some reason, but I haven’t figured that out yet. Now you can see that the Max Beacon Interval before traffic starts and after traffic stops is measurable at 100000 microseconds or 100ms. Here the time scale to too compact, so next I zoom in. ![]() The default time scale is too big to see what is going on, so next I set the Interval to 100ms. 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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