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Firewalld configuration and usage

If you are a Linux old-timer, who is used to iptables (or even ipchains, or even … anyway), you might find “Firewalld configuration and usage” guide very handy.  It covers firewalld concepts and provides a number of examples for zones, ports, services, interfaces and other bits and pieces that you might be scratching your head about, when configuring the modern Linux firewall.

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