Linux Firewall Tips

•    Disable the firewall:
    o    >systemctl disable firewalld
•    Install the iptables-service:
    o    >yum install iptables-services
•    Enable iptables
    o    >systemctl enable iptables
    o    Now you can save iptables:
            >service iptables save
•    To stop the firewall:
    o    >systemctl stop firewalld
•    Check status of the firewall:
    o    >systemctl status firewalld
•    To start the firewall:
    o    >systemctl firewall start
•    To enable the firewall:
    o    >systemctl enable firewall