Computer and IT knowledge - things to know

firewall-cmd > allow port only for specific ip address

firewall-cmd could be used for example on linux centos or red hat

(1) remove old rule, that allows all source addresses (if there is such a rule)
firewall-cmd --zone=public --remove-port=8443/tcp --permanent

(2)
firewall-cmd --permanent --zone=public --add-rich-rule='rule family="ipv4" source address="172.20.4.69/32" port protocol="tcp" port="8443" accept'

(3)
firewall-cmd --reload

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