[Snort-users] Stream4 behavior

Joel Esler joel.esler at ...1935...
Mon Mar 27 14:06:07 EST 2006


You say you went from 200 to about 3000?  What changed?  Please  
provide more info if you could, we'd be glad to help.

J

On Mar 27, 2006, at 4:24 PM, sekure wrote:

> Question:
>
> I went from seeing around 200 stream flushes per second to about 3000.
>  Needless to say CPU spiked to 100% and snort is dropping upwards of
> 60% of packets.
>
> I tried increasing the stream4 memcap from defaul 8MB to 128 MB with
> no improvement in performance.
>
> This is an Intel 2.8 Xeon with 1GB RAM which had no problems dealing
> with ~80-90Mbps on an average basis.
>
> Here is my relevant config:
> preprocessor stream4: disable_evasion_alerts, detect_scans, memcap
> 134217728, timeout 60
> preprocessor stream4_reassemble: both
>
> While i hunt down the source of the problem, can someone answer my  
> questions:
>
> Other than the stream timing out based on the timeout value, what else
> would cause a stream to be flushed?
> What can I do to enable snort to cope better with this?
>
>
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