To start IP tables on your RedHat server,
# service iptables start
You can run the following command to stop iptabes:
# service iptables stop
It is also important to save your iptables configuration so that it is loaded again on the next reboot. This can be done by running:
# service iptables save
You can also set the iptables program to start on boot by running:
# chkconfig iptables on
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