Configure your router with DHCP and instead of using the upstream DNS server from your ISP configure in the servers from UnblockUS. Additionally create a firewa

Configure your router with DHCP and instead of using the upstream DNS server from your ISP configure in the servers from UnblockUS. Additionally create a firewall rule or null static route that denies all network connectivity to 8.8.8.8 and 8.8.4.4. Under the above configuration the chromecast will obtain a IP address and the DNS resolver from the router. Chromecast devices provide no way to configure DNS servers and by default does not trust the responses from your router, instead it trusts and uses Google DNS servers, it's only when network connectivity is blocked does the chromecast "degrade" to using the DNS server provided by the router. If your router is good enough I highly suggest creating two networks by aliasing your uplink, then applying a firewall rule to the uplink that blocks the DNS servers and then tagging by MAC address all devices such as TV/Consoles etc. That way for day to day computering you can use your standard resolvers but traffic is from entertainment network/devices is forced to go out via your tagged uplink - which blocks google DNS and uses UnblockUS for resolution. Better security practice as it means you can be very specific as to what devices should be allowed to be man in the middled/traffic rewritten by UnblockUS. MITM your TV? who cares, MITM your workstation - yeah not a good idea.