I would like to make my Pi-hole DNS server hosted on Oracle Cloud work well, because I managed to make it work, the problem is that not very safely, because it only worked with the Source CIDR of 0.0.0.0/0 on UDP and TCP ports 53 allowed in the Security List of the virtual network of my instance in the cloud and the option "Permit all origins" enabled in Pi-hole. I think a better option would be in place of 0.0.0.0/0 in the Source CIDR I put the public IP of my home network, however it is a dynamic IP, that is, I would have to change it always. So I wanted a good and secure solution to these problems, so I could only allow specific devices on my DNS server, perhaps allowing some via MAC address as well.
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