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How to configure zones bound by source IPs in FirewallD For CentOS, Fedora, RHEL

FirewallD is nothing but a frontend tool for iptables for CentOS, RHEL, Fedora and other Linux distributions. It comes with both graphical and commands line interfaces. From the tutorial:

Some network services should only be exposed to other computers on the same trusted network. Here is how you set that up with trusted zones in FirewallD for centOS, Fedora, and RHEL.