Pihole is a network wide ad blocker. Using DHCP we can tell every device on your network to automatically and transparently use Pihole for DNS. But what if you have custom DNS entries in your firewall? I use OPNsense but this process largely transposes to PFsense as well.
When your laptop makes a DNS request, it is sent to Pihole. Pihole performs a lookup and if it can't find the requested address, forwards that request on to the next DNS server in the chain. If OPNsense has that DNS record in
