Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux Activating the IPTables Service

The firewall rules are only active if the iptables service is running. To manually start the service, use the following command as the root user:
~]# service iptables restart
iptables: Applying firewall rules:                         [  OK  ]
To ensure that iptables starts when the system is booted, use the following command:
~]# chkconfig --level 345 iptables on