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Cisco Bug: CSCvt52607 - Reduce SSL HW mode flow table memory usage to reduce the probability of Snort going in D state

Last Modified

Sep 03, 2020

Products (1)

  • Sourcefire Defense Center

Known Affected Releases

6.4.0 6.4.0.9 6.5.0.2

Description (partial)

Symptom:
snort was using excess memory than what was allotted to it and it was going in swap, possibly resulting in D-state fault.

Conditions:
SSL HW mode policy or CaptivePortal policy must be present.    
Per-snort memory grows to be higher than its budget.
Normal high load traffic does not cause this issue.    There must be some TCP irregularities involved such as dropped packet - that will stimulate the SSL flow table to grow beyond budget because it is not closing flows in a timely manner.
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