[SR-Users] TCP SYN only

Daniel-Constantin Mierla miconda at gmail.com
Tue Sep 9 14:46:09 CEST 2014


Hello,

have you checked the file in the sources located at doc/tcp_tunning.txt?

Cheers,
Daniel

On 09/09/14 14:40, Laurent Schweizer wrote:
> Dear all,
>   
>   
> 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.
>   
> 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
> 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
> 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
> 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
>   
> 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.
>   
> Any idea ?
>   
> Best regards
>   
> Laurent
>   
>   
> /net.ipv4.ip_forward = 0/
> /net.ipv4.conf.default.rp_filter = 1/
> /net.ipv4.conf.default.accept_source_route = 0/
> /kernel.sysrq = 0/
> /kernel.core_uses_pid = 1/
> /net.ipv4.tcp_syncookies = 0/
> /net.bridge.bridge-nf-call-ip6tables = 0/
> /net.bridge.bridge-nf-call-iptables = 0/
> /net.bridge.bridge-nf-call-arptables = 0/
> /kernel.msgmnb = 65536/
> /kernel.msgmax = 65536/
> /kernel.shmmax = 68719476736/
> /kernel.shmall = 4294967296/
> /net.ipv4.tcp_timestamps = 1/
> /net.ipv4.tcp_fin_timeout = 30/
> /net.ipv4.tcp_keepalive_time = 1200/
> /net.ipv4.tcp_max_syn_backlog = 8192/
> /net.ipv4.tcp_max_tw_buckets = 5000/
> /fs.file-max = 2097152/
> /net.ipv4.ip_local_port_range = 2000 65535/
> /net.ipv4.tcp_max_tw_buckets = 1440000/
> /net.ipv4.tcp_tw_recycle = 1/
> /net.ipv4.tcp_tw_reuse = 1/
> /net.core.somaxconn = 65536/
> /net.core.netdev_max_backlog = 65536/
>   
>   
>   
>   
>   
>   
>   
>
>
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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany

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