[Snort-users] snort 2.9.3 - PreProcessor Profile stats for PCRE

Russ Combs rcombs at ...1935...
Thu Jun 28 14:18:28 EDT 2012


On Thu, Jun 28, 2012 at 6:52 AM, jbox2705 <jbox2705 at ...11827...> wrote:

>
> Hi All,
>
> Running Snort 2.9.3 on freebsd 9.0.
>
> Looking at the Sonrt's pref. data show 80% packet drop and no data
> processing in irregular intervals.
>
> Turned on PreProcessor Profile stats that shows the PCRE "Checks" and
> "Exists" differ (99% did not "exit").
>
> The snort.conf file has no "pcre_match_limit" or
> "pcre_match_limit_recursion" configured.
>
> The server is not stressed out and have enough free memory.
>
> Did anyone came across similar problem ? any suggestions ?
>
> Thanks,
>
> Jbox
>

Suggest turning on rule profiling and looking for any heavy hitters that
have pcre /O, which overrides the default pcre_match_limit* settings.


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