Linux Kernel TCP keepalive

# Default Values
cat /proc/sys/net/ipv4/tcp_keepalive_time
7200
cat /proc/sys/net/ipv4/tcp_keepalive_intvl
75
cat /proc/sys/net/ipv4/tcp_keepalive_probes
9

# Change Values
echo 43200 > /proc/sys/net/ipv4/tcp_keepalive_time
echo 60 > /proc/sys/net/ipv4/tcp_keepalive_intvl
echo 20 > /proc/sys/net/ipv4/tcp_keepalive_probes

Kaynak :
http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/usingkeepalive.html