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  • Are all they all definitely invalid? You can get unclosed sessions through normal behaviour, when people are involved at least.
    – Paul
    Commented Mar 19, 2012 at 10:01
  • at least in my scenario they are invalid . I am dealing with an IPS device that deals with these exact sequences. I need pin point the specific streams.
    – woodstok
    Commented Mar 19, 2012 at 10:12
  • 1
    I would do this this backwards, and use tcpdump to identify any streams that FIN-ACKed, then use grep to filter these from tcpdump output, then search the remainder for SYN-ACKs. But there may be a better way, so I'll wait for other suggestions.
    – Paul
    Commented Mar 19, 2012 at 13:05