<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"Pr\00E9format\00E9 HTML Car";
margin:0cm;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Texte de bulles Car";
margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.PrformatHTMLCar
{mso-style-name:"Pr\00E9format\00E9 HTML Car";
mso-style-priority:99;
mso-style-link:"Pr\00E9format\00E9 HTML";
font-family:Consolas;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.TextedebullesCar
{mso-style-name:"Texte de bulles Car";
mso-style-priority:99;
mso-style-link:"Texte de bulles";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor="white" lang="FR-CH" link="blue" vlink="purple">
<div class="WordSection1">
<pre><span style="color:#1F497D">Dear all,<o:p></o:p></span></pre>
<pre><span style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D">Since few weeks I have more and more TCP issue, I can see that sometimes the client send a TCP SYN but never get any response. <o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">106.123315 62.12.179.104 -> X.X.X.X TCP 39174 > sip [SYN] Seq=0 Win=4380 Len=0 MSS=1380 TSV=4294942209 TSER=0 WS=1<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">109.124384 62.12.179.104 -> X.X.X.X TCP 39174 > sip [SYN] Seq=0 Win=4380 Len=0 MSS=1380 TSV=4294942510 TSER=0 WS=1<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">111.202946 62.12.179.104 -> X.X.X.X TCP 4993 > sip [SYN] Seq=0 Win=4380 Len=0 MSS=1380 TSV=4294942717 TSER=0 WS=1<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">114.204707 62.12.179.104 -> X.X.X.X TCP 4993 > sip [SYN] Seq=0 Win=4380 Len=0 MSS=1380 TSV=4294943018 TSER=0 WS=1<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D">I have found on internet many doc regarding TCP and max connection issue and I have already done change in sysctl (see below) to increase the number of tcp connection but seems still not ok.<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D">Any idea ?<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D">Best regards<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D">Laurent<o:p></o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.ip_forward = 0<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.conf.default.rp_filter = 1<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">net.ipv4.conf.default.accept_source_route = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">kernel.sysrq = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">kernel.core_uses_pid = 1<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_syncookies = 0<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.bridge.bridge-nf-call-ip6tables = 0<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.bridge.bridge-nf-call-iptables = 0<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.bridge.bridge-nf-call-arptables = 0<o:p></o:p></span></i></pre>
<pre><i><span lang="DE-CH" style="font-size:8.0pt;color:#1F497D">kernel.msgmnb = 65536<o:p></o:p></span></i></pre>
<pre><i><span lang="DE-CH" style="font-size:8.0pt;color:#1F497D">kernel.msgmax = 65536<o:p></o:p></span></i></pre>
<pre><i><span lang="DE-CH" style="font-size:8.0pt;color:#1F497D">kernel.shmmax = 68719476736<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">kernel.shmall = 4294967296<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_timestamps = 1<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_fin_timeout = 30<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_keepalive_time = 1200<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_max_syn_backlog = 8192<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_max_tw_buckets = 5000<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">fs.file-max = 2097152<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D">net.ipv4.ip_local_port_range = 2000 65535<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_max_tw_buckets = 1440000<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_tw_recycle = 1<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.ipv4.tcp_tw_reuse = 1<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.core.somaxconn = 65536<o:p></o:p></span></i></pre>
<pre><i><span lang="EN-US" style="font-size:8.0pt;color:#1F497D">net.core.netdev_max_backlog = 65536<o:p></o:p></span></i></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
<pre><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></pre>
</div>
</body>
</html>