firewall-cmd CentOS 7

firewall-cmd --list-all

firewall-cmd --zone=public --list-interfaces

firewall-cmd --permanent --list-all

firewall-cmd --get-active-zones

firewall-cmd --permanent --zone=public --add-port=2234/tcp

firewall-cmd --permanent --zone=public --remove-service=dhcpv6-client

reload to complete :

sudo firewall-cmd --reload

sudo systemctl disable firewalld

Настройка firewalld CentOS 7 с примерами командbozza.ru