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Updated in [July 27th, 2023]

This course is designed to provide learners with a comprehensive understanding of Linux Security and Iptables. It covers major topics related to Netfilter and Iptables, including Ipset, advanced matches and targets, NAT, port forwarding, user-defined chains, and more. The course is taught by a DevOps Engineer and Professional Trainer with almost 20 years of experience in Linux Sysadmin, Security Engineering, and Full Stack Development. It assumes the learner is new to Netfilter, Iptables, and Linux Firewalls, and provides them with the knowledge and skills to create Iptables rules that filter incoming, outgoing, or routed traffic based on any possible criteria, log malicious traffic, prevent DoS attacks, use Ipset to drop tens of thousands of networks with no performance degradation, optimize Iptables firewalls, automate different firewall security tasks using shell scripts, configure NAT and MASQUERADE, and configure port forwarding (DNAT). The course also includes quizzes to test the learner's knowledge.

Course Syllabus

Course Introduction

Netfilter/Iptables Basics

The Iptables Command

Challenges - The Iptables Command

Iptables Basic Matches

Challenges - Basic Matches

Iptables Advanced Matches

Challenges - Advanced Matches

Advanced Firewall Configuration with Ipset

Iptables Targets

Challenges - TARGETS

NAT and Port Forwarding

User-defined Chains

Netfilter/Iptables Chain Traversal In Depth

Firewall Automation using Shell Scripts

[APPENDIX] Bash Shell Scripting

[APPENDIX] Challenges - Bash Scripting

BONUS SECTION