Some time it is necessary to increase or decrease timeouts on TCP sockets. You can use /proc/sys/net/ipv4/tcp_keepalive_time to setup new value.
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).
For example set value to 2400 seconds:
echo 2400 > /proc/sys/net/ipv4/tcp_keepalive_time
You can make changes to /proc filesystem permanently using /etc/sysctl.conf
- See man page of ip(7) and tcp(7) for more details.
- Securing and Optimizing Linux book (by OpenNA), network optimization chapter