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Hello,<br>
<br>
have you checked the file in the sources located at
doc/tcp_tunning.txt?<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 09/09/14 14:40, Laurent Schweizer
wrote:<br>
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<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 style="color:#1F497D" lang="EN-US">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 style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US">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 style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US">Any idea ?<o:p></o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US">Best regards<o:p></o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US">Laurent<o:p></o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.ip_forward = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.bridge.bridge-nf-call-ip6tables = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.bridge.bridge-nf-call-iptables = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.bridge.bridge-nf-call-arptables = 0<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="DE-CH">kernel.msgmnb = 65536<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="DE-CH">kernel.msgmax = 65536<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="DE-CH">kernel.shmmax = 68719476736<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">kernel.shmall = 4294967296<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_timestamps = 1<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_fin_timeout = 30<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_keepalive_time = 1200<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_max_syn_backlog = 8192<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">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 style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_max_tw_buckets = 1440000<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_tw_recycle = 1<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.ipv4.tcp_tw_reuse = 1<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.core.somaxconn = 65536<o:p></o:p></span></i></pre>
<pre><i><span style="font-size:8.0pt;color:#1F497D" lang="EN-US">net.core.netdev_max_backlog = 65536<o:p></o:p></span></i></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
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<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla
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