To view the keepalive value, use sysctl, in /usr/sbin/sysctl:
% sysctl net.inet.tcp.keepidle
Set the KEEPALIVE value, using sysctl:
% sudo sysctl -w net.inet.tcp.keepidle=n
where n is the keepalive interval.
The interval is the value of a timer that is counted down 2 times a second. Therefore, to set the keepalive interval to 15 minutes, use 60*15*2, or 1800.
You must have System Administration privileges to set keepalive. systole must
be run under 'sudo'.
