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Re: TCP session without 3-way handshake - Snort 2.9.4.5
From: waldo kitty <wkitty42 () windstream net>
Date: Thu, 16 May 2013 14:36:25 -0400

On 5/16/2013 00:07, Russ Combs wrote:
129:20 is generated when you configure stream5_tcp with require_3whs
and detect_anomalies and you get traffic for a session without first
seeing the client SYN.  require_3whs is configured with a startup
delay before this rule will fire.  If you don't want those alerts, you
can remove require_3whs or disable the rule.

is it possible that snort not seeing the initial SYN packet is caused by snort 
having dropped packets for some reason?

what would be the best and easiest way to determine this?

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