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Revert firewalld to iptables

On Redhat Enterprise Linux and CentOS 7, the firewall service is changed to firewalld. If you prefer iptables, perform the below steps to change it back.

yum -y install iptables-services

Install your iptables script in /etc/sysconfig.

systemctl mask firewalld

systemctl stop firewalld

systemctl enable iptables

systemctl enable ip6tables

systemctl start iptables

systemctl start ip6tables

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