[Snort-users] Snort ignoring stream4

Adam Keeton akeeton at ...1935...
Thu Apr 5 17:08:21 EDT 2007

Hi Paul,

stream4 uses 8192 as a minimum for the max sessions. There should be a
warning printed at startup.

Try switching your decoder to ac-bnfa to address the packet loss issue.


Paul Melson wrote:
> After upgrading from 2.6.0 to Snort is using a much greater
> amount of CPU and memory.  After looking at perfmonitor output, it
> seems to be maxing out at ~ 8K sessions pretty much 24/7 despite the
> following in snort.conf:
> preprocessor stream4: disable_evasion_alerts, server_inspect_limit
> 300, memcap 209715200, max_sessions 2048
> It seems to be ignoring max_sessions and memcap both.  Any body else
> run across this issue?  It's causing the sensor to peak at around 20%
> packet loss during high traffic periods.
> Thanks,
> PaulM
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Adam Keeton      Software Engineer
Snort Team       Sourcefire,Inc   
www.snort.org    www.sourcefire.com

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