Overview

For over two decades, iptables was the standard. But as networks grew faster and infrastructure became more complex, the legacy firewall struggled to keep up. The Linux kernel has moved on. The future is nftables-a unified, programmable, and high-performance packet filtering engine that powers modern Linux distributions. Linux Firewalls with nftables is the definitive guide to making this transition. This book is not just a syntax reference; it is a strategic roadmap for modernizing your entire security infrastructure. Whether you are a system administrator tired of managing dual-stack rulesets, a DevOps engineer fighting with Docker networking, or a security professional seeking O(1) performance at scale, this book provides the answers. In this comprehensive guide, you will learn how to: Finally Replace iptables: Translate your mental models and legacy scripts into the structured, hierarchical logic of nftables. Unify Your Security: Use the powerful inet family to manage IPv4 and IPv6 traffic in a single, coherent ruleset, eliminating ""shadow"" vulnerabilities. Boost Performance: Abandon linear rule processing. Master Sets and Maps to block 50,000 IP addresses or route traffic to hundreds of containers with no increase in CPU load. Control Traffic Flow: Implement dynamic rate limiting, quotas, and ""tar pits"" to neutralize brute-force attacks and DDoS attempts in real-time. Solve the Container Conflict: Deep dive into the friction between Docker/Kubernetes and the firewall. Learn how to isolate containers, manage NAT manually, and regain control of your forwarding chains. Automate & Scale: Treat your firewall as software. Deploy rulesets with Ansible, version control them with Git, and write Python scripts that update your defenses dynamically without reloading the service. From the first ""Hello World"" rule to complex DMZ architectures and Intrusion Detection System (IDS) integration, this book takes you from novice to architect. Don't let your infrastructure rely on deprecated technology. Master nftables today and build a firewall that is faster, smarter, and easier to manage.

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