Guide to Configuring FirewallD as a Firewall Solution on Debian 13 (Trixie)

The article presents the configuration of FirewallD as a firewall solution on a Debian 13 server (codename Trixie). It details the installation and management steps for rules using firewall-cmd, including defining zones, opening ports (e.g., 80/TCP, 443/TCP), and ensuring configuration persistence. The guide targets system administrators looking to replace iptables or nftables with a more dynamic interface. No specific vulnerabilities or operational impacts are mentioned.