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unknown device and what apps have their own resolver built in

Hello. I just installed and configured nextdns on my android device. I noticed under the setup it tells me to use a specific address xxxxxx.dns.nextdns.io for my private dns on my device.

but then it goes into other addresses for "identify your devices" so which address am i using in the provite dns setting of my phone? it can only accept one. 

 

do i use the xxxxxx.dns or the DNS-over-TLS/QUIC? 

Second, the thought just accured to me... how do i know if my apps are using nextdns or their own resolver? if they are using their own resolver, how do i not have them do that? if they use thier own resolver, should i block that app? if so, how? rethink firewall?

thanks
 

EDIT: i set my private dns to thishouldbreakeverything.test and then opened up apps one at a time.. youtube for sure by passes, so does the google play store for at least searching, not downloading. 

1 reply

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    • Mike_V
    • 4 hrs ago
    • Reported - view

    If your private DNS setting uses DNS over TLS/QUIC and you want it to be identified separate from your other devices, you would put

    devicename-xxxxxx.dns.nextdns.io

    in your device's Private DNS setting. The example above would add a "devicename" entry to your analytics and logs so you can see what that specific device is looking up.

    For your second question... it would be very poor form for an app to be using its own DNS servers (aside maybe from a VPN app/service). All other apps should perform DNS via the operating system, so private DNS should be used if you have entered it.

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