9 Sep
2014
9 Sep
'14
3:40 p.m.
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