[Snort-users] Snort and high performance networks

Rafael Ortega rafael.ortega at ...11845...
Fri May 21 12:06:04 EDT 2004

I've tried both FreeBSD and now Linux without doing any modification to the
kernels.  I'll admit that my information might be wrong, but that is what
I'm sniffing according to the switch interface I'm using to monitor the

As for the snort performance, I base my numbers on the output snort gives
when you stop it.  Can somebody sugest a better way to get more accurate

The hardware is a stock Dell (rackmount series, 26xx can't remember exactly
and I'm not close to it right now) with dual Xeon 2.4GHz and 1 GB of RAM.

Of course, I see that I'm wrong (can't be 800Mbits if I'm using 100Mbit
interfaces).  Doh!  I will repost with the correct numbers when I get them.

-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net]On Behalf Of snort user
Sent: viernes, 21 de mayo de 2004 10:59
To: snort-users at lists.sourceforge.net
Subject: RE: [Snort-users] Snort and high performance networks


Ive snipped out some of the recent posts to this thread. Weve been doing
extensive research into snort speeds at my University and to me it seems
like these 2 posts are completely innaccurate and absurb. Chad claims to
capture all traffic with all rules and preprocessors with a $2500 piece of
hardware, while if you buy a $50,000 solution from Sourcefire(home of the
creator of snort) you can only get 1 Gig and they disable rules and
And then when Chris asked you your specs on your box you differ him to

Even getting 800 Mb/s as Rafael said is not impossible but  really is not
feasible without hardcore kernel modifcation and maybe even silicon chips
and ASIC cards.

Would either of you like to share how your able to do this, I mean the
technologies and hardware you using?  Also how do you verify these results?

-- UoC --

-- snip Rafael Ortega--
>I'm currently snorting close to 800Mbps with no problem.  What to do with
>the amount of info, is another story.  I tried ACID, but after 24 hours and
>700,000 events registered, the data base becomes too slow, even after
>indexing certain reference fields.
-- end snip --

-- snip Kreimendahl, Chad --
>FWIW... I've got systems that are easily handling between 3-4Gbps each.
>That's partially hardware, partially OS, and a little tiny config work.
>Very near to all rules enabled on these interfaces, as well as all of
>the preprocessors (minus the broken ones), and a database output plugin.
>0 dropped packets.   If you check the archives for this list, you'll
>find discussions about kernels that can do polling against network
>devices, and how this enhances snort performance on high speed links
>(network performance in general, really).  I believe I mention the OSes,
>maybe some config info and hardware used.
-- end snip --

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