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<p class="MsoNormal"><span lang="EN-GB">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I’ve switched from PCAP mode to PF_RING and now I realize that suricata is getting much less pakets, it is, instead of our usual 300.000 pkt/s to just 40.000 pkt/s (according to stats file). In fact alerts generated dropped
drastically, my Kibana visualization can confirm it!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Stats file does not report any drop, so it may be related to PF_RING? OR the way I’ve configured Suricata for PF_RING?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">My config:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">runmode: workers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">pfring:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> - interface: eth2<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> threads: 8<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> cluster-id: 94<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> cluster-type: cluster_flow<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> - interface: eth3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> threads: 8<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> cluster-id: 94<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> cluster-type: cluster_flow<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">(I’ve got 2 x 8-core CPU, 32GB RAM)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">My previous config was default runmode with default pcap settings, it worked perfect, just that cpu was near 100% most time and I wanted it to scale a bit more
</span><span lang="EN-GB" style="font-family:Wingdings;mso-fareast-language:CA">J</span><span lang="EN-GB" style="mso-fareast-language:CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">PF_RING info:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">[root@nex-ids-01 suricata]# cat /proc/net/pf_ring/info<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">PF_RING Version : 6.0.2 ($Revision: 8014$)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Total rings : 16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Standard (non DNA) Options<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Ring slots : 4096<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Slot version : 16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Capture TX : Yes [RX+TX]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">IP Defragment : No<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Socket Mode : Standard<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Transparent mode : Yes [mode 0]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Total plugins : 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Cluster Fragment Queue : 6819<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-family:Consolas;mso-fareast-language:CA">Cluster Fragment Discard : 825409065<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">Cluster Fragment Discard could have something to do?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">From files /sys/class/net/eth2/statistics/rx_packets and /sys/class/net/eth3/statistics/rx_packets I can confirm that packets are arriving to the Linux box at a ratio of about 300.000 pkt/s
however suricata reports a ratio of about 40.000 pkt/s in its stats file, without drops. I have no idea in which point the packets are dissappearing.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">Any clue?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:CA">Xavier Romero<o:p></o:p></span></p>
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