This hack just make the time default values for TCP/IP connection lower so that more connections can be handled by time on your TCP/IP protocol. The following
will decrease the amount of time your Linux box will try take to finish closing a connection and the amount of time before it will kill a stale connection.
This will also turn off some IP extensions that aren't needed.
The default setup for the TCP/IP parameters we'll change under Red Hat Linux are:
For the tcp_fin_timeout 180
For the tcp_keepalive_time 7200
For the tcp_window_scaling 1
For the tcp_sack 1
For the tcp_timestamps 1
To adjust the new TCP/IP values, type the following commands on your terminal:
[root@deep] /#echo 30 >/proc/sys/net/ipv4/tcp_fin_timeout
[root@deep] /#echo 1800 >/proc/sys/net/ipv4/tcp_keepalive_time
[root@deep] /#echo 0 >/proc/sys/net/ipv4/tcp_window_scaling
[root@deep] /#echo 0 >/proc/sys/net/ipv4/tcp_sack
[root@deep] /#echo 0 >/proc/sys/net/ipv4/tcp_timestamps
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Execute the above commands and put them in your
/etc/rc.d/rc.local file so you don't need to type them again each time your system reboots.
Edit the
/etc/sysctl.conf file and add the following lines:
# Decrease the time default value for tcp_fin_timeout connection
net.ipv4.tcp_fin_timeout = 30
# Decrease the time default value for tcp_keepalive_time connection
net.ipv4.tcp_keepalive_time = 1800
# Turn off the tcp_window_scaling
net.ipv4.tcp_window_scaling = 0
# Turn off the tcp_sack
net.ipv4.tcp_sack = 0
# Turn off the tcp_timestamps
net.ipv4.tcp_timestamps = 0
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You must restart your network for the change to take effect. The command to manually restart the network is the following:
[root@deep] /# /etc/rc.d/init.d/network restart
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Setting network parameters [ OK ]
Bringing up interface lo [ OK ]
Bringing up interface eth0 [ OK ]
Bringing up interface eth1 [ OK ]
