For security purposes and ensuring you’re not clogging your own low voltage pipes, your “DNS address” should be local. If you use Google or your ISP’s DNS address any connection to your local devices can only be accessed by IP addresses because you have no way to have a DNS point to a name to a host with an numeric IP address.
Local IP addresses are kinda like the FRS radio bands, ones that ISPs are expected to not route for the purposes of having a local area networks routable.
- 10.0.0.0 to 10.0.0.255
- 172.16.0.0. 172.24.255.255
- And 192.168.1.0 192.168.254.255
The local DNS address should point out to the firewall or wireless router. Many smaller end devices have the ability to basic DNS if you have a few devices where you want to connect them by domain-name.
With all these cyber attacks, it’s best to separate what’s exposed to the overall Internet, and what should be local. Computing devices should be connected with a local IP and DNS address and appliances that help route local devices to the overall Internet should be the ones with the most exposure like having the Google DNS address.
Just do the right thing, and keep your devices protected with a better structured local network