Firewalld is a firewall management tool for Linux operating systems. It provides an interface for managing and configuring firewall rules to control incoming and outgoing network traffic. Firewalld is included in most modern Linux distributions, such as Red Hat Enterprise Linux, CentOS, Fedora, and Debian.

Firewalld uses a zone-based approach to manage network connections. A zone is a collection of rules that define how the firewall should behave when a device or network is connected to it. For example, a public zone may have more restrictive firewall rules than a private zone. Firewalld comes with several predefined zones, but users can also create custom zones with their own rules.

Firewalld supports multiple network protocols and services, including IPv4, IPv6, TCP, UDP, and ICMP. It also supports firewall services, which are predefined rules that allow or block specific network services.

One of the advantages of Firewalld over traditional firewall tools is its dynamic nature. It allows administrators to change firewall rules without restarting the firewall, which is useful for managing firewalls in environments with a large number of devices and services.

Overall, Firewalld is a powerful and flexible tool for managing firewall rules on Linux systems, making it easier for administrators to secure their networks and control network traffic.

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