Start by saving your current iptables rules if there are any.
If you are using CentOS 6.2 or 6.5, save your current iptables rules with the following command:

/sbin/service iptables save

If you are using CentOS 7 the base installation does not include iptables-services. You will need to install it before your firewall is persistent through boots

yum install -y iptables-services
systemctl enable iptables
systemctl start iptables

To save your current rule set use the following command

/usr/libexec/iptables/iptables.init save

That’s it! Your firewall rules are in place and protecting your server. Remember, you’ll need to edit the firewall rules later if you install other software or services.

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