firewall Archives

Deploy CrowdSec on Linux: Building a Distributed IPS to Block Brute Force and Web Attacks

October 19, 2026

Tired of isolated log parsers missing distributed brute-force sweeps? Here is how to deploy CrowdSec on Linux to shut down coordinated SSH and web attacks using collaborative, crowd-sourced threat intelligence.

HomeLab

Install and Configure OPNsense on Proxmox VE: Multi-VLAN Routing, Zenarmor, and Hardened HomeLab Security

October 18, 2026

Deploy virtualized OPNsense on Proxmox VE using VLAN-aware Linux bridges, strict inter-VLAN firewall rules, and Zenarmor Next-Gen inspection to secure your homelab.

Security

Mastering nftables on Linux: Building a Modern Stateful Firewall to Replace iptables

October 6, 2026

A production-tested guide to replacing iptables with nftables on Linux. Learn how to configure unified IPv4/IPv6 filtering, rate limiting, and atomic zero-downtime rule updates.

HomeLab

Securing Your HomeLab with CrowdSec on Docker: Collaborative Intrusion Prevention

October 2, 2026

Secure your self-hosted services by running CrowdSec in Docker. This step-by-step guide shows how to parse proxy logs, connect community threat feeds, and block attackers at the host firewall level.

Networking

GeoIP Blocking with nftables and MaxMind GeoLite2 on Linux: Filter Traffic by Country

May 29, 2026

GeoIP blocking with nftables and MaxMind GeoLite2 lets you drop traffic from entire country IP ranges at the firewall level, before it reaches your application. This guide covers the full setup: downloading the database, extracting country ranges, loading them into nftables sets, and automating bi-weekly updates with systemd and cron.

Networking

Advanced Network Diagnostics: Mastering hping3 for Firewall Testing on Linux

May 15, 2026

Ditch the limitations of standard ping. This guide explores hping3 for advanced Linux network diagnostics, showing you how to craft TCP packets and test firewall rules with precision.

Networking

VyOS CLI Guide: Building a Professional Virtual Router from Scratch

May 7, 2026

Turn any virtual machine into a high-performance enterprise router. This guide provides hands-on CLI instructions for VyOS routing, stateful firewalls, and NAT configuration.

Networking

Cloudflare Tunnel: Securely Expose Internal Services Without Opening Firewall Ports

March 27, 2026

Picture this: It's 2 AM, and you need to expose an internal service. Opening firewall ports is a massive security risk, but Cloudflare Tunnel offers a secure, port-free solution. This guide details how to set it up, allowing you to safely publish web apps and SSH without compromising your network.

HomeLab

Supercharge Your Home Network: Building a Powerful Router & Firewall with pfSense/OPNsense

March 22, 2026

Tired of your consumer router's limitations and security gaps? Discover how pfSense or OPNsense can transform your home network into a robust, secure, and highly configurable powerhouse, ideal for any HomeLab enthusiast. This guide covers essential setup, key features, and practical configuration examples.

Security

How to Set Up a Firewall with UFW / iptables for Linux Server Security

March 12, 2026

My server recently survived an intense SSH brute-force attack, reinforcing the urgent need for strong security. This tutorial walks you through setting up UFW, the Uncomplicated Firewall, to defend your Linux server from unauthorized access. Learn to configure crucial rules and maintain a secure system.