[Oisf-users] Help with good configuration for Suricata install with Napatech card

Wed Oct 14 10:14:15 UTC 2015

Hi Steve.

I think what Victor means is that with a Napatech card you are able to distribute your traffic to different hostbuffers, fx based on a 5 tuple index. You can then have a Suricata thread for each hostbuffer, and hereby distribute your load.

First thing I would check in your setup is if your ‘monitoring’ tool (default location: '/opt/napatech3/bin/monitoring’) are showing drops or errors. If that is the case Suricata is not taking packets of the Napatech hostbuffers fast enough.

Best Regards
Jesper

On 13 Oct 2015, at 19:59, Stephen Castellarin <castle1126 at yahoo.com<mailto:castle1126 at yahoo.com>> wrote:

Hi Victor,

I'm trying to understand what you meant by making "sure all packets from a flow are delivered to the same Suricata thread".

Right now I'm looking at the /proc/interrupts and it shows that CPU 1 is handling the interrupts for the Napatech card (based on lscpu NUMA node 1 is handling CPUs 1,3,5,7,9,11,13,15,17,19).  I've set the Napatech card to assign its HostBuffersRx to NUMA node 1.  Would it be wise to set the CPU affinity for receive, decode and stream-cpu-set to all the CPUs on NUMA node 1?  And if so, then should I assign the detect-cpu-set to the other CPUs on NUMA node 0?

Steve

On Friday, October 9, 2015 12:01 PM, Victor Julien <lists at inliniac.net<mailto:lists at inliniac.net>> wrote:

On 09-10-15 17:15, Stephen Castellarin wrote:
> Yes there still is progress to make.  Looking at CPU utilization through
> SAR, for today I'm seeing an average of 88.86 %idle, so they're not
> being overworked.  As far as memory consumption, stats are showing I'm
> using roughly 50gb of 128gb available.  So I know I have plenty of
> breathing room from the hardware's perspective.

One thing to check is how the card does the traffic distributions. You
need to make sure all packets from a flow are delivered to the same
Suricata thread. IIRC napatech cards give you a lot of control there.

Cheers,
Victor

> To your point about the rules, I know I've stripped down a whole bunch
> of the ETPRO rules - only sticking with the exploit, malware, scan,
> trojan, current_events, web_server and web_specific_apps rules.  The
> largest number of rules from that list are in the trojan.rules (~9763),
> web_specific_apps.rules (~5603) and current_events.rules(~2505).  When I
> cut down to that list of rule files from the full ETPRO rule list that
> definitely cut out unnecessary stuff for us.  It's going to be real
> tough to dig through the remainder to see what is pertinent to us and
> what isn't.
>
>
>
> On Friday, October 9, 2015 10:32 AM, Rob MacGregor
> <rob.macgregor at gmail.com<mailto:rob.macgregor at gmail.com>> wrote:
>
>
> On Fri, Oct 9, 2015 at 3:05 PM Stephen Castellarin <castle1126 at yahoo.com<mailto:castle1126 at yahoo.com>
> <mailto:castle1126 at yahoo.com<mailto:castle1126 at yahoo.com>>> wrote:

>
>    Sorry for the quick reply yeaterday, I forgot to hit Reply All.
>
>    As for the tuning, I know my current, underpowered Suricata system
>    is missing events, as is my new hardware/configuration.  I base this
>    on some attack traffic I saw from one IP yesterday.
>
>    So our configuration is a front end router feeding an inline IPS
>    which then is tapped - one tap to my old Suricata system and the
>    second to my new Suricata system.  From a full take packet capture I
>    see 45 attempts to issue malicious POST attempts to a webserver we
>    have.  My original Suricata system triggered on 10 of those while my
>    new Suricata triggered on 15.  I then took the pcap I extracted and
>    ran it through Suricata on the new system and that system showed it
>    trigger on all 45.  So that's giving me a feeling that I'm not
>    tuning something correct - causing the running Suricata to miss things.
>
>
> So, things are improving but there's still progress to make?
>
> I'd look at things like CPU and RAM usage - are you maxing out your
> CPUs/RAM?
>
> Also, really look at those rules, are they really all relevant to your
> network? Also, if you strip it down to just the rules that'd catch those
> POST attempts, does it fire for every event?
>
> --
>  Rob

>
>
>
>
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--
---------------------------------------------
Victor Julien
http://www.inliniac.net/
PGP: http://www.inliniac.net/victorjulien.asc
---------------------------------------------

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_______________________________________________
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