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<p>Sure. Home nets are nothing special.</p>
<p>123.123.64.0/18,123.123.128.0/18</p>
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<p>Is there a way to find out which process in Suricata is eating up the CPU? Maybe that's how I can trace it down to what is causing dramatic packet loss.</p>
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<p>Thank you all.</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Oisf-users <oisf-users-bounces@lists.openinfosecfoundation.org> on behalf of Andreas Herz <andi@geekosphere.org><br>
<b>Sent:</b> Tuesday, July 5, 2016 8:20 PM<br>
<b>To:</b> oisf-users@lists.openinfosecfoundation.org<br>
<b>Subject:</b> Re: [Oisf-users] number of alerts versus performance</font>
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<div class="PlainText">On 01/07/16 at 14:03, Yasha Zislin wrote:<br>
> My guess would be that the packet loss is due to the traffic type and<br>
> home_net definition. This sensor is in management zone so it has a lot<br>
> of Active Directory, SSH, RDP, and other management traffic. I dont<br>
> know if this can have a negative impact on performance.<br>
<br>
Can you share your HOME_NET definition (with example IPs)?<br>
So far we can just guess :)<br>
<br>
> <br>
> For example, I have another sensor which mostly processes HTTP/S and<br>
> SQL/Oracle traffic with 50mil packets a minute and it only has couple<br>
> of % of packet loss. Sam physical server with the same suricata config<br>
> with the exception of HOME_NET<br>
> <br>
> <br>
> ________________________________ From: Peter Manev<br>
> <petermanev@gmail.com> Sent: Thursday, June 30, 2016 9:57 PM To: Yasha<br>
> Zislin Cc: oisf-users@lists.openinfosecfoundation.org Subject: Re:<br>
> [Oisf-users] number of alerts versus performance<br>
> <br>
> On Thu, 2016-06-30 at 17:14 +0000, Yasha Zislin wrote:<br>
> > More info. It seems my threads process different amount of packets.<br>
> > It is not evenly distributed. Is there a setting somewhere for that<br>
> > in Suricata or in PFRING? It seems that thread with 100% cpu<br>
> > utilization changes from one to another over time. At that time I<br>
> > notice from stats.log that new busy thread is processing more<br>
> > packets.<br>
> ><br>
> <br>
> You mentioned earlier you were messing around with a number of diff<br>
> settings - might be related. Did you use the irq affinity script (if<br>
> you got an Intel nic)?<br>
> <br>
> ><br>
> ><br>
> ><br>
> > ______________________________________________________________________<br>
> > From: Peter Manev <petermanev@gmail.com> Sent: Thursday, June 30,<br>
> > 2016 4:27 PM To: Yasha Zislin Cc:<br>
> > oisf-users@lists.openinfosecfoundation.org Subject: Re: [Oisf-users]<br>
> > number of alerts versus performance<br>
> ><br>
> > On Thu, 2016-06-30 at 15:54 +0000, Yasha Zislin wrote:<br>
> > > Peter,<br>
> > ><br>
> > ><br>
> > > I found one alert that was causing high alert count. After I've<br>
> > > disabled it, count went down but packet loss is still around 20%.<br>
> > ><br>
> > ><br>
> > > my stats.log does not contain anything useful such as flow<br>
> > > emergency mode, or ssn memcap drop. The only thing that is off is<br>
> > > kernel<br>
> > drops,<br>
> > > and tcp reassembly gaps. From my understanding kernel drops have<br>
> > > nothing to do with Suricata and point to OS problems.<br>
> > ><br>
> > ><br>
> > > I do see one of the CPUs peak at 100% when packet loss increases.<br>
> > One<br>
> > > thing to note. Two other CPUs are working on capturing traffic<br>
> > > with high IRQs. My guess would be flow manager or detection<br>
> > > engine.<br>
> > ><br>
> ><br>
> ><br>
> > You can see if you get more info from: top -H -p `pidof suricata`<br>
> > and perf top -c cpu_number_here example: perf top -c 0<br>
> ><br>
> > > I dunno.<br>
> > ><br>
> > ><br>
> > > Thanks<br>
> > ><br>
> > ><br>
> > ><br>
> > ><br>
> > ><br>
> > ______________________________________________________________________<br>
> > > From: Peter Manev <petermanev@gmail.com> Sent: Thursday, June 30,<br>
> > > 2016 3:00 PM To: Yasha Zislin Cc:<br>
> > > oisf-users@lists.openinfosecfoundation.org Subject: Re:<br>
> > > [Oisf-users] number of alerts versus performance<br>
> > ><br>
> > > On Thu, 2016-06-30 at 14:41 +0000, Yasha Zislin wrote:<br>
> > > > I have been trying to figure out a packet loss on one of my<br>
> > sensors<br>
> > > > and I am puzzled.<br>
> > > ><br>
> > > > It is has 16 gigs of RAM, one quad core AMD CPU, and nic sees<br>
> > about<br>
> > > 3<br>
> > > > million packets per minute. Nothing special in my mind. I am<br>
> > > > using PFRING 6.5.0 and Suricata 3.1.<br>
> > > ><br>
> > > > I get about 20% to 40% packet loss. I have another identical<br>
> > server<br>
> > > > which sees the same amount of traffic and maybe some of the same<br>
> > > > traffic as well.<br>
> > > ><br>
> > > > I've been messing around with NIC settings, IRQs, PFRING<br>
> > > > settings, Suricata settings trying to figure out why such a high<br>
> > > > packet<br>
> > loss.<br>
> > > ><br>
> > > ><br>
> > > > I have just realized one big difference in these two sensors.<br>
> > > > Problematic one gets 2k to 4k of alerts per minute which sounds<br>
> > > huge.<br>
> > > ><br>
> > ><br>
> > > Any particular sig that is alerting in excess ?<br>
> > ><br>
> > > > Second one gets like 80 alerts per minute. Both have the same<br>
> > > > rulesets.<br>
> > > ><br>
> > > ><br>
> > > > The difference of course is the home_net variable.<br>
> > > ><br>
> > > ><br>
> > > > Can the fact that Suricata processes more rules due to HOME_NET<br>
> > > > definition cause high performance strain on the server?<br>
> > > ><br>
> > ><br>
> > > Yes HOME_NET size has effect on performance as well (among other<br>
> > > things). For example - HOME_NET: "any" EXTERNAL_NET: "any" will<br>
> > > certainly degrade your performance.<br>
> > ><br>
> > > ><br>
> > > > If the packet does not match per HOME_NET, it will be discarded<br>
> > > before<br>
> > > > being processed in rules. Correct?<br>
> > > ><br>
> > > > Versus if packet passes HOME_NET check, it would have to go<br>
> > through<br>
> > > > all of the rules, hence cause higher CPU utilization.<br>
> > > ><br>
> > > ><br>
> > > > Thank you for the clarification.<br>
> > > ><br>
> > > ><br>
> > > > _______________________________________________ Suricata IDS<br>
> > > > Users mailing list:<br>
> > > oisf-users@openinfosecfoundation.org<br>
> > > > Site: <a href="http://suricata-ids.org" id="LPlnk533363">http://suricata-ids.org</a> | Support:
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> [<a href="https://secure.gravatar.com/blavatar/b35fe77e09a7541f738f500f4db6b857?s=200&ts=1467381526]<http://suricata-ids.org/">https://secure.gravatar.com/blavatar/b35fe77e09a7541f738f500f4db6b857?s=200&ts=1467381526]<http://suricata-ids.org/</a>><br>
> <br>
> Suricata<<a href="http://suricata-ids.org/">http://suricata-ids.org/</a>> suricata-ids.org Open Source IDS /<br>
> IPS / NSM engine<br>
> <br>
> <br>
> <br>
> ><br>
> ><br>
> > Suricata suricata-ids.org Open Source IDS / IPS / NSM engine<br>
> ><br>
> ><br>
> > > <a href="http://suricata-ids.org/support/">http://suricata-ids.org/support/</a><br>
> > ><br>
> > ><br>
> > > Suricata suricata-ids.org Open Source IDS / IPS / NSM engine<br>
> > ><br>
> > ><br>
> > > > List:<br>
> > > <a href="https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users">
https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users</a><br>
> > > > Suricata User Conference November 9-11 in Washington, DC:<br>
> > > <a href="http://oisfevents.net">http://oisfevents.net</a><br>
> > ><br>
> > ><br>
> ><br>
> ><br>
> <br>
> -- Regards, Peter Manev<br>
> <br>
<br>
> _______________________________________________<br>
> Suricata IDS Users mailing list: oisf-users@openinfosecfoundation.org<br>
> Site: <a href="http://suricata-ids.org">http://suricata-ids.org</a> | Support: <a href="http://suricata-ids.org/support/">
http://suricata-ids.org/support/</a><br>
> List: <a href="https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users">
https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users</a><br>
> Suricata User Conference November 9-11 in Washington, DC: <a href="http://oisfevents.net">
http://oisfevents.net</a><br>
<br>
<br>
-- <br>
Andreas Herz<br>
_______________________________________________<br>
Suricata IDS Users mailing list: oisf-users@openinfosecfoundation.org<br>
Site: <a href="http://suricata-ids.org">http://suricata-ids.org</a> | Support: <a href="http://suricata-ids.org/support/">
http://suricata-ids.org/support/</a><br>
List: <a href="https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users">
https://lists.openinfosecfoundation.org/mailman/listinfo/oisf-users</a><br>
Suricata User Conference November 9-11 in Washington, DC: <a href="http://oisfevents.net">
http://oisfevents.net</a></div>
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