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How to save "Decode As" into .pcapng file?

asked 2023-05-18 15:12:34 +0000

pac122 gravatar image

I am using the latest Wireshark from master repository on Ubuntu 23.04. I test several different servers and install options with different port number configurations. I see I constantly set Analyze | Decode As to set protocol to be recognized on specific port.

I also know I can permanently save this info in Edit | Preferences | Protocols | specific protocol | TCP port(s).

But in my case port numbers frequently change and I don't want to set them permanently in Wireshark preferences, but also setting them manually in "Decode As" is also little bit annoying.

I am wondering if this decode as port relationship can be somehow saved in .pcapng file itself. This would be the best option for me. I am reopening captured files frequently and if port-decode-relationship would be there I think it would be the best.

Is it possible to save decode as info in .pcapng file?


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answered 2023-05-18 16:13:27 +0000

André gravatar image

No, you cannot save a 'decode as' instruction in a pcapng.

But you can add a comment to a pcapng.
And provide the 'decoce as' as a command line option -d. For example:

wireshark -d tcp.port==8888,http -r myfile.pcapng &

So it is possible to create a little script that launces Wireshark with the (temporary) decode as setting. (E.g. based on some info in the filename or extract the comment with tshark.)

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Another option is to store them in a seperate profile. I always recommend to use profiles a lot.

hugo.vanderkooij gravatar imagehugo.vanderkooij ( 2023-05-19 08:18:02 +0000 )edit

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Asked: 2023-05-18 15:12:34 +0000

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Last updated: May 18