Force all devices to use private dns server

Hi, I need some help to force all devices to use private DNS server even it is use VPN

See: https://openwrt.org/docs/guide-user/firewall/fw3_configurations/intercept_dns

OpenVPN does not use pushed DNS servers by default

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I have used this method but I have VPN in chrome and it is bypass my DNS server

I do not use Chrome, I know it can use its private DNS server on port 853 which you can counter by setting a Canary domain and redirecting port 853.

If Chrome really uses a VPN then nothing you can do about it sort of using BanIP to block the address of the VPN server

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