[Snort-users] Rule performance profiling question

Andy Berryman aberryman at ...14765...
Thu Sep 16 09:07:31 EDT 2010


Joel wrote that they "both are SO rules."

 

What does that have to do with it? Does it make a difference that they
are so rules? 

 

Thanks for the help,

Andy 

 

 

 

From: Alex Kirk [mailto:akirk at ...1935...] 
Sent: Wednesday, September 15, 2010 3:44 PM
To: Andy Berryman
Cc: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Rule performance profiling question

 

Definitely turn off SID 7019 - that's for a Japanese P2P service that's
probably not on your network.

 

SID 14643 is something you'll want to consider more closely based on the
likelihood of being patched in your network. That said, your assessment
of performance there is correct - it's expensive for not a great deal of
return in your environment.

On Wed, Sep 15, 2010 at 4:37 PM, Andy Berryman <aberryman at ...14758...>
wrote:

Does this mean I should turn off this rule b/c of the amount of checks
and zero alerts for it? 

 

Rule Profile Statistics (worst 100 rules)

==========================================================

   Num      SID GID Rev     Checks   Matches    Alerts
Microsecs  Avg/Check  Avg/Match Avg/Nonmatch

   ===      === === ===     ======   =======    ======
=========  =========  ========= ============

     1     7019   3   5  234171143         0         0
80911378        0.3        0.0          0.3

 

 

 

What about this one? Not as many checks, but it takes a while to check
it each time. 

 

Rule Profile Statistics (worst 100 rules)

==========================================================

Num      SID GID Rev     Checks   Matches    Alerts           Microsecs
Avg/Check  Avg/Match Avg/Nonmatch

==      === === ===     ======   =======    ======           =========
=========  ========= ============

76    14643   3   3      82610         0         0             4949758
59.9        0.0         59.9

 

 

 

Thanks,

Andy Berryman

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Alex Kirk
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Sourcefire Vulnerability Research Team
+1-410-423-1937
alex.kirk at ...1935...


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