{"id":336,"date":"2009-10-28T14:06:20","date_gmt":"2009-10-28T14:06:20","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2009\/10\/28\/checkpoint-is-changing-syn-packets-to-acks\/"},"modified":"2021-07-30T14:42:52","modified_gmt":"2021-07-30T14:42:52","slug":"checkpoint-is-changing-syn-packets-to-acks","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html","title":{"rendered":"Check Point is changing SYN packets to ACKs ?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-66265226e7f62\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-66265226e7f62\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Issue\" title=\"Issue\">Issue<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Inbound\" title=\"Inbound \n\">Inbound \n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Outbound\" title=\"Outbound: \n\">Outbound: \n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Cause\" title=\"Cause \">Cause <\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Do_we_need_this_feature\" title=\"Do we need this feature ?\">Do we need this feature ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#What_else_do_I_need_to_know\" title=\"What else do I need to know ? \">What else do I need to know ? <\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Solution\" title=\" Solution \n\"> Solution \n<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#Temporarily\" title=\"Temporarily\">Temporarily<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#IPSO\" title=\"IPSO\">IPSO<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#SPLAT\" title=\"SPLAT\">SPLAT<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\/#References\" title=\"References\">References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Issue\"><\/span><strong>Issue<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The initial SYN packets from your client to your server are\u00a0 translated by your Firewall into ACK packets. This in turn\u00a0 prevents the initial 3 way handshake establishing.<\/p>\n<p>Below shows an example,<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inbound\"><\/span>Inbound<span style=\"font-family: tahoma,arial,helvetica,sans-serif;\"><br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"codemulti\">15:32:19.546115 I 10.1.1.1.12345 &gt; 192.168.1.1.1111: S 2292544025:2292544025(0) win 49640 &lt;mss 1460,nop,wscale 0,nop,nop,sackOK&gt; (DF)<br \/>\n15:32:22.924625 I 10.1.1.1.12345 &gt; 192.168.1.1.1111: S 2292544025:2292544025(0) win 49640 &lt;mss 1460,nop,wscale 0,nop,nop,sackOK&gt; (DF)<br \/>\n15:32:29.684476 I 10.1.1.1.12345 &gt; 192.168.1.1.1111: S 2292544025:2292544025(0) win 49640 &lt;mss 1460,nop,wscale 0,nop,nop,sackOK&gt; (DF)<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Outbound\"><\/span>Outbound<span style=\"font-family: tahoma,arial,helvetica,sans-serif;\">:<br \/>\n<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"codemulti\">15:32:19.546791 O 10.1.1.1.12345 &gt; 192.168.1.1.1111: . ack 3336546225 win 49640 (DF)<br \/>\n15:32:22.925787 O 10.1.1.1.12345 &gt; 192.168.1.1.1111: . ack 1868928554 win 49640 (DF)<br \/>\n15:32:29.685355 O 10.1.1.1.12345 &gt; 192.168.1.1.1111: . ack 3910026716 win 49640 (DF)<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cause\"><\/span><strong>Cause <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This is due to a Check Point feature called Smart Connection Reuse.<br \/>\nWhen a client tries to establish a new connection to a server on the same port as a previously established connection that the client\/server believes is terminated, but that the firewall does not, the firewall tries to determine what state the connection is in by sending an ACK (instead of a SYN).<br \/>\nDependent on the response to the ACK (from the server) the firewall concludes whether the firewall allows the initial SYN or refuses it.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_we_need_this_feature\"><\/span><strong>Do we need this feature ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Before Smart Connection Reuse was added to the Check Point software package any SYN that came to the firewall which matched an exsisting connection (same source\/destination port\/ip) would be dropped and a log message of &#8220;SYN on Established Connection&#8221; would be created.<br \/>\nThis feature prevents new connections from being unnecessarily dropped.<span style=\"font-family: tahoma,arial,helvetica,sans-serif;\"><br \/>\n<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_else_do_I_need_to_know\"><\/span><strong>What else do I need to know ? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This feature can be useful but certain setups and situatio can cause this feature not to function as per design. Such as,<\/p>\n<ul>\n<li>The server is not responding to the ACK with a RST which would tell the Firewall this is a new connection and allow it to pass the SYN.<\/li>\n<li>The servers RST response to the SYN isn\u2019t reaching the Firewall.<\/li>\n<li>The server\/client is not correctly closing down the connection, causing the connection state information on the firewall to remain.<\/li>\n<li>Another firewall is blocking the ACK or RST.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Solution\"><\/span><strong> Solution<br \/>\n<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>You may find you have a scenario which fits one of the above points, and ACK packets are leaving the firewall and no response is being given. In which case the initial 3 way handshake is failing.<\/p>\n<p>To allow for the firewall to allow a SYN through a established connection the following kernel global setting should be applied.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Temporarily\"><\/span>Temporarily<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In order to set the option Temporarily (does not survive reboot) the following kernel settings is applied.<\/p>\n<ol>\n<li>fw ctl set int fw_reuse_established_conn [port_number]<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"IPSO\"><\/span>IPSO<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li><strong>modzap fw_reuse_established_conn $FWDIR\/boot\/modules\/fwmod.o [port_number]<\/strong><\/li>\n<li>Then reboot<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"SPLAT\"><\/span>SPLAT<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Add the line &#8220;<strong>fw_reuse_established_conn=[port_number]<\/strong>&#8221; to the file <strong>$FWDIR\/boot\/modules\/fwkern.conf <\/strong><\/li>\n<li>Then Reboot<\/li>\n<\/ol>\n<p>Further details of changing kernel global parameters can be found within sk26202 (Changing the kernel global parameters on all platforms).<span style=\"font-family: tahoma,arial,helvetica,sans-serif;\"><br \/>\n<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>sk33285 &#8211; Kernel Global Parameters<\/li>\n<li>sk39455 &#8211; Why does the firewall change certain SYN packets to ACK packets ?<\/li>\n<li>sk24960 &#8211; VPN-1\/FireWall-1 NG with AI R54 modifies some SYN packets, and changes them to ACK<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Issue The initial SYN packets from your client to your server are\u00a0 translated by your Firewall into ACK packets. This in turn\u00a0 prevents the initial 3 way handshake establishing. Below shows an example, Inbound 15:32:19.546115 I 10.1.1.1.12345 &gt; 192.168.1.1.1111: S 2292544025:2292544025(0) win 49640 &lt;mss 1460,nop,wscale 0,nop,nop,sackOK&gt; (DF) 15:32:22.924625 I 10.1.1.1.12345 &gt; 192.168.1.1.1111: S 2292544025:2292544025(0) win &#8230; <a title=\"Check Point is changing SYN packets to ACKs ?\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Checkpoint\/checkpoint-is-changing-syn-packets-to-acks.html\" aria-label=\"Read more about Check Point is changing SYN packets to ACKs ?\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Check Point is changing SYN packets to ACKs ? - Fir3net<\/title>\n<meta name=\"description\" content=\"Issue The initial SYN packets from your client to your server are\u00a0 translated by your Firewall into ACK packets. 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