Let's learn about L2 isolation with VLANs and dive into basic network architecture with OPNsense. After playing a bit with IPv4, let's discuss unicorn-issues IPv6 for your homelab-ing. Then expanding with WireGuard for simple inter-machine networks. Continuing, we will take a look into Linux network namespaces and a few tricks you can do with your systems to bypass "security" - and also how to defend against it.

So, it is 2025 and mailservers are getting more and more replaced by cloud-based solutions, which promise to be easy and secure... But what if you can just do it yourself? Hosting your private message server and applying common modern mailserver security practices on your own? This talk wants to introduce a few common software solutions and introduce multiplie techniques from an operators toolbox.

You want to learn more about Linux permissions? This is the talk for you. Let's learn about the basic UID/GID concepts in Linux and expand into more complex ACLs. Then escalating on the "everything-is-a-file" concept and applying the learned security logic onto program behavior using SELinux or AppArmor.