On Thursday 30 January 2014 06:41:06 Owais ul Haq wrote:

I am trying to understand kamailio.cfg parameters. Can some one please help me in understanding what these parameters do exactly when set. tcp_keepalive, tcp_keepidle and tcp_connection_lifetime. I have a general understanding of tcp. Want to know exact role of these parameters in kamailio.cfg. Thanking in advance.

According to http://www.kamailio.org/wiki/cookbooks/3.2.x/core#tcp_keepalive these options manipulates the socket options as decribed in "man 7 tcp"

So: tcp_keepalive

Enables keepalive for tcp (sets SO_KEEPALIVE socket option)

tcp_keepalive = yes | no (default yes)

enables: tcp_keepalive_time (integer; default: 7200; since Linux 2.2) The number of seconds a connection needs to be idle before TCP begins sending out keep-alive probes. Keep-alives are only sent when the SO_KEEPALIVE socket option is enabled. The default value is 7200 seconds (2 hours). An idle connection is termi‐ nated after approximately an additional 11 minutes (9 probes an interval of 75 seconds apart) when keep-alive is enabled.

Note that underlying connection tracking mechanisms and applica‐ tion timeouts may be much shorter.