TecMint published a quick tutorial about opening a port on a specific IP Address in Firewalld on RHEL or CentOS
How to Open Port for a Specific IP Address in Firewalld
How can I allow traffic from a specific IP address in my private network or allow traffic from a specific private network through firewalld, to a specific port or service on a Red Hat Enterprise or CentOS server.
How to Open Port for a Specific IP Address in Firewalld
