Snort mailing list archives

Re: Pass rule vs. threshold/suppression


From: Gentoo-Wally <gentoowally () gmail com>
Date: Tue, 25 Jul 2006 12:24:12 -0400

On a related note then,

It might be a good idea to expand the suppression syntax to allow
joining 'track by_src' and 'track by_dst' in one statement.

I use a lot of pass rules and suppression statements to limit FP
without disabling the rule. I'm often reluctant to use a suppression
statement, because what I really want to suppress is an alert to a
specific address from a specific network, which I believe right now
requires requires a pass rule.

Thx,
Wally

On 7/25/06, Joel Esler <joel.esler () sourcefire com> wrote:
Wally,

This is a good question.  Thanks for asking.

Pass rules and Suppression are pretty much processed at the same time, however, suppression does not require rule 
ordering, so it's preferred your use Suppression.

J

On Tue, Jul 25, 2006 at 11:27:57AM -0400, Gentoo-Wally sent me:
Hi,

From a performance standpoint, is it better to use a pass rule or a
suppression statement to prevent an alert from triggering for a
spacific rule to/from a spacific IP/network?

Wally

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