If you want to resolve a specific domain with a specific resolver/nameserver, add this:
sudo mkdir /etc/resolver
sudo echo "nameserver <IPAddress>" >> /etc/resolver/internal.domain.io
This was tested on Big Sur 11.2.3
If you want to resolve a specific domain with a specific resolver/nameserver, add this:
sudo mkdir /etc/resolver
sudo echo "nameserver <IPAddress>" >> /etc/resolver/internal.domain.io
This was tested on Big Sur 11.2.3