How to highlight certain packets in wireshark and save them to a file?

Question

linux

How to extract certain packets (responses) in wireshark, for example, packets from DNS and save them to a file?

Answer 1

If it makes sense to filter traffic at the capture stage, you should, sorry for the captaincy, use capture filters (berkeley packet filter), the link was provided to you by Avtandil Tridvarasov .
If there is already a dump that needs to be filtered, then you need display filters . In the case of DNS, enter the string "dns" without quotes in the Filter field, then File -> Export specified packets..., in the Packet range window that appears: Displayed radio button.