[SR-Users] TCP SYN only

[Laurent Schweizer]

Hi,

Yes I check them, the only 2 point that I have actually not tested is to change :

- You might have to decrease TCP_BUF_SIZE to a smaller value (e.g 8K)
- You might want to increase PKG_MEM_POOL_SIZE (for large queues)


I'm using Kamailio 3.2.1

I have set:
tcp children to 50
tcp_max_connections=104096

started wit  -m 4096  -M 64

with sockstat I have:

sockets: used 2171
TCP: inuse 913 orphan 1 tw 4 alloc 939 mem 29
UDP: inuse 440 mem 372
UDPLITE: inuse 0
RAW: inuse 1
FRAG: inuse 0 memory 0


BR

Laurent

De : sr-users-bounces at lists.sip-router.org [mailto:sr-users-bounces at lists.sip-router.org] De la part de Daniel-Constantin Mierla
Envoyé : mardi 9 septembre 2014 14:46
À : Kamailio (SER) - Users Mailing List
Objet : Re: [SR-Users] TCP SYN only

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


















_______________________________________________

SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list

sr-users at lists.sip-router.org<mailto:sr-users at lists.sip-router.org>

http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users



--

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20140909/a7f5ca1b/attachment.html>