[Snort-users] Snort and high-traffic lines

Erek Adams erek at ...577...
Mon Sep 30 07:12:02 EDT 2002

On Mon, 30 Sep 2002, Jens Krabbenhoeft wrote:

>   I have been playing around with snort (1.9.0b6) quite a while now,
> trying to get snort work with a big ruleset (~ 1200 rules, HOME_NET set
> to one /19 and one /16, EXTERNAL_NET set to any) in a high-traffic
> environment.


> What would be the right hardware to snort that much traffic?
> What would be the right OS?
> How can I improve snort's performance in general (when changing the
> ruleset and changing HOME/EXTERNAL_NET is not possible)?
> How did you deploy snort successfully in a high-bandwidth environment?
> Any tweaks for the OSes such as adjusting buffers, ...?

One thing that you can do that will speed things up:  Don't use multiple nets
in HOME_NET.  Instead, use two snort processes that use a different .conf
file.  That would also let you slim down your rules, since you could disable
ones that don't have anything to do with your net.

Other things to consider:

  *  Change your disk subsystem to high end SCSI.
  *  More RAM
  *  Faster CPU
  *  More CPU's if your OS will support them well.

You might want to have a look at this link[0] as well.  It's message from
Marty discussing this very thing.

Hope that helps!

Erek Adams

[0]	http://www.theadamsfamily.net/~erek/snort/perf.txt

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