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So for connections entering via tun0 (the internal side), that leave to an external destination on the DNS,
we redirect them to our dns server (10.53.1.53), although we could pick an external server if we wanted to.
Don't forget the ! -d 10.53.1.53 part is important, because without it, you end up in a loop
The server it's natting to has an adblock dnsbl so it makes it easy to check if its working
dig +short @8.8.8.8 ad.doubleclick.net
0.0.0.0
It's quite handy for devices like chromecasts, phone, etc that can be quite stubborn when it comes to using anything that isn't the google recursive dns server (8.8.8.8 8.8.4.4)