There are 2 steps required to allow our service to work correctly with Chromecast.
- Configure our DNS servers on your router
It's not possible to configure DNS servers on the Chromecast directly, so this needs to be done on your router.
See the instructions here: Configuring DNS Servers on your Router
- Block Chromecast from using Public DNS Servers
Chromecast is hard-coded to use Google's DNS servers. The good news is if you block access to Google's DNS, it falls back to the DNS servers configured on your router (ours!).
See the instructions here: Block Public DNS Servers