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7.2.2. Saving and Restoring iptables Rules
Firewall rules are only valid for the time the computer is on; so, if the system is rebooted, the rules are automatically flushed and reset. To save the rules so that they are loaded later, use the following command:
/sbin/service iptables save
The rules are stored in the file
/etc/sysconfig/iptablesand are applied whenever the service is started or restarted, including when the machine is rebooted.