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May 1, 2026 · Information Security
Mastering Linux Firewalls: Core Netfilter Concepts and Practical iptables/firewalld Configuration
This guide walks Linux operators through the fundamentals of Netfilter, explains iptables tables, chains and rule‑matching order, and provides step‑by‑step commands for configuring, saving, and troubleshooting iptables, firewalld and ufw in production environments.
Linux firewallfirewall configurationfirewalld
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