Answer by grahamb for Hi All, can I somehow "undissect" tcp2123/tcp2152 that are currently dissected as GTP? When I click Decode As... , select the last entry in the table (with tcp2123 or tcp2152) and click "-" and save it I still get it dissected as GTP. Apparently entire tcp port space is allowed for use by K8s mgmt comms just 'cos it's Google - no need to check IANA that has them reserved (albeit never actually used) for GTP..... Thanks in advance!

You can disable the GTP dissector. From the menu, Analyze -> Enabled Protocols -> enter gtp in the search field, uncheck the GTP dissector(s).