Q. How do I start Iptables firewall under RHEL / Red Hat / CentOS / Fedora Linux from a shell prompt? How do I stop firewall?
A. First, you need to configure firewall rules by editing text file located at /etc/sysconfig/iptables. You can also use setup command to configure firewall. Just type the following as root user:
# setup
Select Firewall configuration and just follow on screen instructions.
Once configuration is updated type the following 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
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