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This is a mistake you only make once, which is why I now have a dedicated dmz network for work equipment that doesn't use the pihole for DNS resolution.
I just have my router fail over to 1.1.1.1 if pihole disappears. (I donāt use pi-hole for dhcp). It saves my ass from this.
Interesting idea, may I know what router you're using which supports this feature? One of the things I do like about having work related DNS going through pihole is I can create custom responses to trick my laptop into thinking it's on the office network, which disables our VPN requirement. š
As far as I have seen, they all can do this. Just set your DNS to your pi and your second DNS to cloudflair or whichever.
If your pi is missing, it goes to the second listing
Or have 2 piholes on 2 separate pieces of hardware, giving you the opportunity to fix things should one go down.