You can use any of those for DNS, Unbound, Pihole, Adguard, etc..
this post was submitted on 08 Oct 2024
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How do I set that up for access outside my network?
I don't want to tunnel traffic with wireguard since my upload is too low.
Tunnel just DNS over wireguard in that case, instead of using it as a default gateway and tunneling all traffic.
I recommend setting up selective routing in your opnsense wireguard and use that for the PrivateDNS. That way you won't tunnel traffic through your home unnecessarily.