Secure the Raspberry Pi and remove others

In the last section of this chapter, we will talk about security. Raspberry Pi Zero W is great but no one wants to just plug it in your router and let others control your lights, your coffee machine, and anything else you have connected there. To begin with, the truth is that you cannot be secure from anyone. This means that there are levels of security that you should consider. At this point, you should consider from whom you want to be secured. For example, there are techniques for securing your Raspberry from your family, from your friends, from anyone in your house, from typical users on the internet, from advance users on the internet, and from NSA.

Firewall

Almost every router has a firewall option. Firewall is a system that is able to filter all incoming connections and choose whether every single one of them is OK to let it pass to your network or not. In the following screenshot, you can see the Firewall option at my router settings. It may...