In this blog, you’ll learn how to turn off or disable firewall permanently under Linux / Fedora / Red Hat Enterprise Linux and CentOS.
iptables is the administration tool/command for IPv4 packet filtering and NAT. You need to use the following tools:
[a] service is a command to run a System V init script. It is used to save/ stop/start firewall service.
[b] chkconfig command is used to update and queries run level information for system service. It is a system tool for maintaining the /etc/rc*.d hierarchy. Use this tool to disable firewall service at boot time. 
How Do I Disable Firewall in Linux?
First login as the root user.
Next enter the following three commands to disable the firewall. [ads1]
service iptables save service iptables stop chkconfig iptables off
If you are using IPv6 firewall, enter: [ads2]
# service ip6tables save # service ip6tables stop # chkconfig ip6tables off
This is how you can turn off or disable the firewall permanently under Linux.
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