Re: This is great
"If you wish to switch to negotiating an HTTPS connection on a diffetent port then presumably the DNS code in your home router will have to be updated to do three things. Handle a local HTTPS DNS request and pass that on to the configured ISP (or other) DNS server. Handle an old style DNS request and roll it over into HTTPS. Handle legacy DNS from end to end."
This is over-complicating it. The Router doesn't need to care. Just get the router to present the IP of a DoH DNS server and the OS will communicate directly with that. The router will not need to get involved. It's only if your router acts as a DNS proxy and will only present its own address as a DNS server, which you can't change, that it would be affected but you can still put manual DNS in your OS if you want it secured.
Port 53 DNS will still be around as long as your router is.
RE Footnote: I can't ever imaging that the browser would specify the DNS that you *have* to use. Makes no sense.
Biting the hand that feeds IT
