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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I had the same problem. I was told that Suricata was only getting half the traffic and that I should use like below also.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>sudo iptables -I FORWARD -o eth0 -i eth1 -j NFQUEUE<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I think the order of the interfaces and packet direction is important to watch for.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Another way was:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>sudo iptables -I FORWARD - m physdev --physdev-in eth0 --physdev-out eth1 -j NFQUEUE<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>sudo iptables -I FORWARD - m physdev --physdev-out eth0 --physdev-in eth1 -j NFQUEUE<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was told that af-packet IPS is more efficient and we use it for IPS mode.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a href="https://home.regit.org/2012/09/new-af_packet-ips-mode-in-suricata/" target="_blank">https://home.regit.org/2012/09/new-af_packet-ips-mode-in-suricata/</a><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>I hope all of this helps. It did for us.<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> oisf-users-bounces@openinfosecfoundation.org [mailto:oisf-users-bounces@openinfosecfoundation.org] <b>On Behalf Of </b>mouna amani<br><b>Sent:</b> Thursday, June 13, 2013 3:30 AM<br><b>To:</b> oisf-users@openinfosecfoundation.org<br><b>Subject:</b> [Oisf-users] I did the installation of suricata as an IPS<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I used NFQ to use surricata as an IPS<o:p></o:p></p><div><p class=MsoNormal>I have three machines:<o:p></o:p></p></div><div><p class=MsoNormal>-a host1 <o:p></o:p></p></div><div><p class=MsoNormal>-a host2 <o:p></o:p></p></div><div><p class=MsoNormal>-an IPS between them<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I followed the steps like in the official website<o:p></o:p></p></div><div><p class=MsoNormal>I used iptables -I FORWARD -i eth0 -o eth1 -j NFQUEUE <o:p></o:p></p></div><div><p class=MsoNormal>iptables -I FORWARD -i eth1 -o eth0 -j NFQUEUE and I check with iptables -vnL <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Then I run suricata -c /etct/suricata/suricata.conf -q 0 <o:p></o:p></p></div><div><p class=MsoNormal> Everthing went well .I only got a warning "no rules to be loaded from emerging-icmp.rules":I downloaded the file from web site and it is in the right place ".<o:p></o:p></p></div><div><p class=MsoNormal>I guess it is only a warning it will not effect the IPS working well ?<o:p></o:p></p></div><div><p class=MsoNormal>Then I tried to ping the host1 from host2 and I got the error destination unreachable .<o:p></o:p></p></div><div><p class=MsoNormal>I think the IPS is blocking all the trafic including the good want<o:p></o:p></p></div><div><p class=MsoNormal>I configured NFQ to work in accept/drop mode .I think it means that if the packets are for an attack they will be dropped ??<o:p></o:p></p></div><div><p class=MsoNormal>I really need help because this is for my final project .<o:p></o:p></p></div><div><p class=MsoNormal>What I did wrong and what should I check ?<o:p></o:p></p></div><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>-- <br><b><i><span style='color:#FF6666;background:#FFCC99'>Amani smiai </span></i></b><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>