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Even if you do that, there’s some devices (Chromecast, Google Home) that have Google’s DNS hardcoded and ignores the servers passed by DHCP.

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What happens if you set your firewall to block 8.8.8.8 and 8.8.4.4?

You can use an iptables rule on your router to rewrite the address to your custom server, which I have done specifically because Google devices were ignoring DHCP.

Something like...

iptables -t nat -A OUTPUT -p udp --dport 53 -j DNAT --to x.x.x.x:53

...should work, and repeat for tcp

It bricks the device. See these previous discussions.

[1]: https://mailarchive.ietf.org/arch/msg/dnsop/WCVv57IizUSjNb2R...

[2]: https://news.ycombinator.com/item?id=19170671

This is terrible. What prevents them from doing the same to android phones and tablets?

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