Have you ever wondered how your office blocks you going on Reddit from work? Well if you have, chances are that there's a firewall somewhere out there at play.

To truly understand it, we will write a very basic firewall from scratch. To keep things simple and understandable, we'll focus on the core concepts of eBPF and XDP and how they can be used to write a very simple IP based firewall.

Finally to wrap things up, the talk will conclude on ideas on how to extend your newly created firewall.

Code presented during the talk will be shared openly on GitHub.