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Workaround for Chromecast DNS #6
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Rather than having to mess around with DNAT and intercept DNS requests, you can simply block the Google DNS servers of
8.8.8.8and8.8.4.4and this will make a Chromecast device use the DNS servers configured via DHCP. I assume Chromecast devices have a check to see if it can reach Google's public DNS addresses, and if it can't it then uses DHCP.You would need to have full control of the firewall at router level to do it, but this is pretty simple to do with an OpenWRT, DD-WRT or similar firmware.