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Local dns rewrite problems on android (lemmy.world)

submitted 10 months ago by marci@lemmy.world to c/selfhosted@lemmy.world

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I have some services set up which i make available with tailscale and a domain name outside my lan. Inside my home network i set up adguard dns rewrites to use the same domain for devices which are not on my tailnet. I disabled dns rebind protection in my fritzbox for these domains.

Now my problem: I don't leave my phone connected to tailscale all of the time because of high battery drain. Inside of my wifi the phone should still be able to access my services using the domain, but it is only able some of the time. My work laptop (not on my tailnet) is able to access the services.

Is the dns cached somehow in android? Is the private dns setting of android overwriting the dns i configured in my router? Where else could the problem lie? Any hints are appreciated :)

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[–] rtxn@lemmy.world 2 points 10 months ago (1 children)

Install Termux, then use either the dig or nslookup command to query the DNS name, and check which DNS server is queried. If it's the private server's address, you might be having connectivity issues. If it's 100.100.100.100, the resolver is still trying to query Tailscale's MagicDNS.

[–] hexagonwin@lemmy.sdf.org 2 points 10 months ago* (last edited 10 months ago) (2 children)

doesn't termux always default to 1.1.1.1?

edit: https://old.reddit.com/r/pihole/comments/iivdgq/psa_termux_on_android_does_not_use_system_dns/ maybe its 8.8.8.8, don't have my phone so can't check rn

[–] rtxn@lemmy.world 1 points 10 months ago

Right... my mistake, I guess I had SSH config entries in Termux and never questioned whether SSH was using those or DNS.

Still, try to find some way to check which server is being queried. It might reveal connectivity problems with the local DNS server.

[–] marci@lemmy.world 1 points 10 months ago

Yes no matter if it works or not, it always returns the tailscale ip I configured with cloudflare, saying it is using 8.8.8.8 as the dns server.