Linux Firewall (Netfilter/iptables)
Understand the basics of Linux firewalls using `iptables` to filter traffic and secure your systems.
Firewalls: Your Network Guardian
What is a firewall? It's like a security guard for your network, controlling what traffic goes in and out. In Linux, the core firewall framework is called Netfilter. We use a command-line tool called iptables to manage its rules.
Netfilter: The Kernel's Core
Netfilter is a powerful framework built right into the Linux kernel. It allows different kernel modules to inspect, modify, and drop network packets.
Think of it as the engine behind the firewall. It provides "hooks" where packet processing can be intercepted.
All lessons in this course
- Packet Capture with Wireshark/tcpdump
- Network Performance Tools
- Linux Firewall (Netfilter/iptables)
- DNS Diagnostics with dig and nslookup