TheDude @ LCS Postat Martie 16 Postat Martie 16 Tutorial: Linux Firewall & Security Basics Security is very important when using Linux, especially on servers connected to the internet. This tutorial explains how to use a firewall to protect your system from unauthorized access. Tutorial Title “Linux Firewall Setup – Protect Your System from Unauthorized Access” A firewall controls which network connections are allowed or blocked on your computer. Many Linux distributions like Ubuntu use UFW, which is a simple way to manage firewall rules. Step 1: Enable the Firewall First, enable the firewall: sudo ufw enable Check the firewall status: sudo ufw status This shows which ports and services are allowed. Step 2: Allow Important Services If you use remote login with OpenSSH, allow SSH access: sudo ufw allow ssh For a web server like Apache HTTP Server, allow HTTP traffic: sudo ufw allow 80 Step 3: Block Unwanted Connections You can block specific ports: sudo ufw deny 23 Port 23 is used by Telnet, which is often disabled for security reasons. Step 4: Delete Firewall Rules To remove a rule: sudo ufw delete allow 80 This helps maintain a clean firewall configuration. Step 5: View Detailed Firewall Rules To see numbered rules: sudo ufw status numbered This makes it easier to manage or delete specific rules. Why This Tutorial Is Important Learning firewall management helps you: Protect your Linux system from hackers Secure servers and VPS machines Control network access Improve overall system security These skills are essential for Linux administrators and cybersecurity learners. SOURCE
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