firewalld Command - Dynamic Firewall Manager

The firewalld command is used to manage firewall rules dynamically. It provides a D-Bus interface and command-line tools to configure and manage firewall zones, services, and rules on Linux systems.

Syntax

firewalld [options]

Examples

firewall-cmd --state

firewall-cmd --zone=public --add-port=80/tcp --permanent

firewall-cmd --reload

Notes

• firewalld uses zones to manage different trust levels for network connections.
• It is a dynamic alternative to static tools like iptables and nft.
• firewalld is the default firewall manager on many modern Linux distributions.