I am trying to find out a way to filter out packets specifying abnormal connection termination in wireshark. I mean is there any tcp.connection.terminated filter in wireshark??

  • 2
    An abnormal TCP connection termination is a RST, so you can filter for that.
    – Ron Maupin
    Feb 11 '20 at 15:22
  • you mean tcp.connection.rst?? Feb 11 '20 at 15:23
  • Would you please also tell me whether normal termination is FIN?? Feb 11 '20 at 15:28

TCP FIN is a normal termination.

Abnormal connection terminations would have TCP RST flag enabled: tcp.flags.reset == 1

A connection can also time out (keepalive SYN is sent more than once, no ACK received back).

You can filter for the TCP SYN flag using display filter tcp.flags eq 0x02 and look for connections that do not receive ACK.

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