Re: snort 2.9.3 - PreProcessor Profile stats for PCRE

[jbox2705 <jbox2705 () gmail com>]

Russ,

thank for the reply.

I'll check the rule stats.

Still , I don't understand what can cause the packet drop in the PCRE - Is
it a buffer filling up ?, reassemble that fails ?.....

Regards,

Jbox

On Thu, Jun 28, 2012 at 9:18 PM, Russ Combs <rcombs () sourcefire com> wrote:

> On Thu, Jun 28, 2012 at 6:52 AM, jbox2705 <jbox2705 () gmail com> 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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