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How DNS are set on android? (europe.pub)
submitted 7 months ago by to c/android@lemmy.world
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I'm using e/os and I want to be sure that, when connected to my local network, my local dns server is used, however, no matter what I do, my phone always use google's one. Is there any way to fix this?

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[–] 2 points 7 months ago (4 children)

how do we get phones to see local DNS records?

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  • [–] 4 points 7 months ago (2 children)

    I had the same problem in my network and the solution is not easy.

    Many, but many android apps are using Google dns servers just to leak the location of the phone (using the nearest geographical Google server).

    The only way I found it was to instsll an opnsense router and redirect requests to port 53 to the internal dns server.

    DoT (dns over tls) is blocked because it can not be redirected

    DoH (dns over https) is (almost) imposible to block and still is a hole in current systems.

    Good luck solving this

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  • [–] 3 points 7 months ago (1 child)

    You can block DoH by using a comprehensive blocklist of DoH domains. Both NextDNS and ControlD do this.

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  • [–] 1 point 7 months ago

    Yep, I checked that possibility too but it is like putting barriers into the see because :

    • DoH can also share the IP-PORT with some legits websites
    • there is not a proper way to scan the web to see if there is a proper service
    • the effort to setup one is orders of magnitude lower tan to track then and then to filter it properly

    Honestly is just the prey-predator competition. It won't stop ever

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