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https://fedoraproject.org/wiki/FirewallD
FirewallD is the default firewall implementation on CentOS 7.
firewall-cmd --state firewall-cmd --reload firewall-cmd --complete-reload firewall-cmd --get-zones firewall-cmd --get-services firewall-cmd --get-services firewall-cmd --get-icmptypes firewall-cmd --list-all-zones