Privacy

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Is there a way to guarantee a mobile device or tablet can only access my own services and block all other traffic? (lemmy.world)

submitted 2 weeks ago by ComradeMiao@lemmy.world to c/privacy@lemmy.ml

12 comments fedilink hide all child comments

cross-posted from: https://lemmy.world/post/21884908

Is this possible on any modern day phone or tablet? Selfhosting as made me very privacy-consciouss and am concerned about my iphone.

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[–] AbouBenAdhem@lemmy.world 13 points 2 weeks ago (1 children)

You could set it to use your own DNS server, and have the server block anything not on a whitelist.

[–] davel@lemmy.ml 5 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

If you don’t want to run your own DNS server/Pi-hole, you might consider NextDNS.

Edit to add: A mobile app could theoretically be sneaky and route around your phone’s DNS settings, but I’ve never heard of that actually happening, so it’s not something I’d worry about.

[–] Mikelius@lemmy.ml 5 points 2 weeks ago

Actually, there are some apps and even phone level things that do try to call to custom DNS, ignoring all the phone settings, including those defined in the global settings. Termux nslookup is one I can think of at the top of my head that ignores the phone's settings and instead tries to call to Google DNS. I've got DNS default blocked in a custom script for AFWall on my phone, excluding calling my custom DNS, and see the block frequently hit. Just now checking, I see 54 blocks on 8.8.8.8:53, 2 blocks on 1.1.1.1:53, and 16 on "other" port 53 (catch all block).

Think the best solution is either a router firewall setup if always on the wifi, or a phone firewall app that can act as a VPN and just default block everything, or something like that. If rooted, AFWall does wonders.