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Rate limiting alerts
From: Mike Kun <mkun () akamai com>
Date: Thu, 09 Dec 2010 15:04:17 -0500

Does Snort have the ability to rate-limit an alert? For example, if we
were interested to know of a maching is part of a DDOS, we coudl
threshold a rule to only fire if there are 250 syn packets in 60 secs.
But, this could fire if a user opens a webpage with lots of redirects or
ads. Therefore, if we'd like to only fire an alert if there is a
sustained number of syn packets over time, for example 50 syn packets
per second for 10 seconds.

It doesn't seem like thresholding can do this...


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