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@lists.sip-router.org [mailto:sr-users-bounces@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
 
 
 
 
 
 
 

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Daniel-Constantin Mierla
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