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HOW TO INSTALLING AND CONFIGURING FIREWALLD ON LINUX

According to the official website of firewalld, ???Firewalld provides a dynamically managed firewall with support for network/firewall zones that define the trust level of network connections or interfaces. It has support for IPv4, IPv6 firewall settings, ethernet bridges, and IP sets. There is a separation of runtime and permanent configuration options. It also provides an interface for services or applications to add firewall rules directly.???.