Firewall Archives - Page 3 of 3 - ITFROMZERO

Configuring a Firewall with iptables on Linux: A Production-Ready Script for Web Servers

By IT From Zero March 4, 2026

A production-ready iptables script for web servers: chains and tables structure, SSH rate limiting, locking down MySQL and Redis, and how to persist rules across reboots. Includes a tip to avoid locking yourself out during testing.

Network

Configuring IPv6 on Linux Servers: Static Addresses, Dual-Stack, and Real-World ip6tables

By IT From Zero March 2, 2026

Step-by-step guide to configuring IPv6 on Linux servers: enabling IPv6, assigning static addresses on Ubuntu/Debian and CentOS/Rocky, setting up dual-stack, ip6tables firewall, and troubleshooting real-world issues.