Table of Contents Title and Copyright Information Preface 1 About Packet-Filtering Firewalls 2 Configuring the Firewall with Firewalld firewalld Configuration Tools Controlling the firewalld Service About Zones and Services Displaying Information About Zones Displaying Zone Settings Configuring firewalld Zones Controlling Access to Services Controlling Access to Ports Assigning a Network Interface to a Zone Changing the Default Zone Setting a Default Rule for Controlling Incoming Traffic Managing Incoming Traffic Based on Sources Creating Customized Zones Using the firewall-cmd Command Using a Zone Configuration File 3 Configuring the Firewall with nftables Disabling the firewalld Service About Rulesets and Tables Managing Rulesets and Tables About Hooks and Chains Creating Base Chains About Rules Creating Rules - Examples Exporting Configurations to a File Loading Configurations from a File Converting iptables to nftables