Welcome to lesson 13.
In this lesson you will learn how to configure a Linux firewall.
I'll first explain about network ports, which are an essential component in Linux firewalls.
Next I'll explain how firewalls are working in general, and after that we can zoom in
and talk about the most common Linux firewall solutions, UFW, Firewall-D, and IP tables.
You'll also learn about NF tables, the latest firewalling solution that has been introduced
to Linux.
And as always, this lesson ends with the lab as well as the lab solution.