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How can I write a filter in Wireshark that checks if the first packet has some field, then checks the new packets for another field, and if they matched, show what you got:

if (someone has my valid usernames and passwords and can log in successfully to my FTP server) then
  show me the result (the IP addresses and usernames that logged in my FTP server)
end

Is this possible with Wireshark?

And can Wireshark use memory? (Keep in mind that if the first frame matched, it needs to check subsequent ones.)

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