What is the reason and how to avoid the [FIN, ACK] , [RST] and [RST, ACK]

Here is a rough explanation of the concepts. [ACK] is the acknowledgement that the previously sent data packet was received. [FIN] is sent by a host when it wants to terminate the connection; the TCP protocol requires both endpoints to send the termination request (i.e. FIN). So, suppose host A sends a data packet to … Read more

Why doesn’t wireshark detect my interface?

This is usually caused by incorrectly setting up permissions related to running Wireshark correctly. While you can avoid this issue by running Wireshark with elevated privileges (e.g. with sudo), it should generally be avoided (see here, specifically here). This sometimes results from an incomplete or partially successful installation of Wireshark. Since you are running Ubuntu, … Read more

How can I add a custom protocol analyzer to wireshark?

You can write dissectors using Wireshark’s LUA API. That way you can write a quick-and dirty dissector without downloading Wireshark’s code, or even a compiler. A very simple, yet powerful example is shown in the documentation. Such a LUA dissector is perfectly fine for debugging use, and even distribution with your project. If you intend … Read more

How do I clear the capture window in Wireshark?

I don’t see a way to clear the window, but hitting ‘Restart the running live capture’ seems to work. You can therefore clear the window in WireShark by doing one of the following: Clicking on the green shark-fin to the right of the red Stop button Clicking on Capture > Restart Hitting Ctrl-R.

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