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====== Rethink DNS + Firewall ======
[[https://rethinkdns.com/app|Rethink DNS + Firewall]] is the easiest way to monitor app activity, circumvent Internet censorship, block ads and trackers on your Android device.
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===== Download and install apk =====
Install RethinkDNS via [[en:phone:apps:f-droid|F-Droid]] - https://f-droid.org/en/packages/com.celzero.bravedns/.
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===== Configuration =====
These are just a few tips.\\
You will probably have to adjust other settings for your environment anyway.
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==== Rethink ====
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=== DNS ===
You can choose between many options.\\
Either use [[/en/server/services/dnscrypt|our DNScrypt server]] or any other DNScrypt server you like. DoH, DoT, ODoH and Rethinks-DNS-Server itself are also available. Even tor and SOCKS5 are included.\\
Also possible your [[/en/server/services/wireguard|own Wireguard server]] in combination with [[/en/server/services/adguardhome|your AdGuard Home server]].
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=== Firewall ===
Enable at least **//Block newly installed apps by default//** under **Configure** -> **Firewall** -> **Universall firewall rules**.
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==== Android ====
After the first start, it is important to set RethinkDNS as the main and only VPN connection in your Android system.\\
For that, got to **Settings** -> **Network & Internet** -> **VPN** -> **Rethinks "Settings Symbol"** -> and enable both **Always-on VPN** and **Block connections without VPN**.
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===== Good to know =====
* **KDE-connect** only works if the “**Do not router Private IPs**” option is activated. This only works if you have not activated the option “**Block connections without VPN**” in your Android settings under “**Always-on VPN**”.
* **Be careful** if Rethink asks you again to allow or continue to block certain applications. Especially if it's just a number like 1021. It might be the case that you are allowing a bunch of applications to access the internet. Which you probably want to block! So check the number twice just in case.
* If you need to use an **application that involves trackers**, simply use the “**Isolate Firewall**” option. Start the application and only give IPS/domains access to the Internet so that this application can run but keep the trackers still blocked.
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===== Example with and without RethinkDNS =====
Just a simple overview of how many connections happen before and after setting up RethinkDNS + Firewall.\\
If you want to check it with your device, just use [[/en/extras/device_inspections|our "Device Inspections" tutorial]].
Before (packets = 775.847):\\
{{:en:phone:apps:rethink-before.png?direct&1200 |775.847 packets):}}
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After (packets = 55.331):\\
{{:en:phone:apps:rethink-after.png?direct&1200 |55.331 packets}}