First, you need to configure firewall rules by editing a text file located at /etc/sysconfig/iptables on RHEL/CentOS/Fedora Linux. You can also use setup command to configure firewall. Just type the following command as root user:
Select Firewall configuration and just follow on screen instructions.
Once configuration is updated type the following service command at a shell prompt:
To start firewall from a shell enter:
# chkconfig iptables on
# service iptables start
To stop firewall, enter:
# service iptables stop
To restart firewall, enter:
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# service iptables restart