DNS caching resolver for home

Preface: the fortigate I am using at home sucks at DNS – in fact it sucks at many things when you are used to a FritzBox – but I am stubborn and I will do this because I work with fortigates and want the learning experience. (and because I am stubborn)

somehow the big models can all do forward DNS services but the FortiWifi40C somehow can’t even act as a DNS gateway / proxy without bringing the internet experience to a grinding halt here.
(I run a small network, about 5 devices and 4 mobiles and if I can feel it I don’t want to know what a small office will experience…)
But: I have this Raspberry that receives audio via zeroconf and is connected to the network and to my amplifier.
Why not have it act as a caching DNS resolver, too?
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