Re: [SR-Users] Configuring TCP keep alive and connection lifetime

Hi I just checked these parameters in runtime (using sysctl -a | grep "tcp_keepalive") and I get: net.ipv4.tcp_keepalive_time = 7200 net.ipv4.tcp_keepalive_probes = 9 net.ipv4.tcp_keepalive_intvl = 75 I recognize the "75" value used in the delay between my k.a. ! It gets clearer :-) My question is: does kamailio set somewhow (parameter of source code constant definition) this net.ipv4.tcp_keepalive_intvl parameter ? Or should I fine tune myself in the OS kernel configuration ?

Cheers Pascal On Mon, May 10, 2010 at 2:33 PM, Klaus Darilion &lt;klaus.mailinglists(a)pernau.at <mailto:klaus.mailinglists@pernau.at>> wrote: Hi Pascal! The TCP keepalive is not an application layer keep alive, but Kamailio just sets the SO_KEEPALIVE socket option. The the TCP keep alive is implemented and performed by the operating systems. Thus, if you want to tweak the TCP keep alive, then you have to tweak the kernel. regards Klaus Am 07.05.2010 16:20, schrieb Pascal Maugeri: "kamailio" &lt;users(a)lists.kamailio.org <mailto:users@lists.kamailio.org> <mailto:users@lists.kamailio.org <mailto:users@lists.kamailio.org>>>, Hi I am sorry to ask again about this topic but I don't understand yet how the TCP keep-alive are sent. With Kamailio 3.0.1 and the following configuration: tcp_keepalive=yes tcp_keepidle=10 tcp_connection_lifetime=3600 The TCP connection is kept alive and TCP Keep-Alive packets are sent when the TCP connection is idle. But I don't understand why the time between KA is not linear: first KA is sent 10 seconds after last last TCP message. This is logical and connected with the tcp_keepidle=10 configuration. then 2nd KA is sent 75 seconds after first KA Then my client sends some traffic and 23 seconds after last message, a new KA is sent. Another time it was 54 seconds. etc. etc. Could you explain me where do come from these values of 75 seconds, 23, 54 ? Everything works well: my client behind NAT is kept connected but I'd like to understand why it does work :-) Thanks in advance, Pascal _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org <mailto:sr-users@lists.sip-router.org> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users