Cast to Chromecast across subnets quickly with 1-click configuration for UniFi USG

Within a few seconds, get Chromecast communicating across your UniFi Security Gateway's configured subnets. Spotify Connect will also be supported.

It took nearly a year for me to land on this simple solution, and it was found coincidentally by me trying to enable cross-subnet AirPlay (sorry, still haven’t gotten that to work securely).

Enable cross-subnet Chromecast casting

To enable casting via Chromecast between subnets, simply do the following.

Enable Multicast DNS to Chromecast across your subnets
  • New Unifi UI: Settings > Gateway > MDNS > Enable Multicast DNS
  • Old Unifi UI: Settings > Services > MDNS > Enable Multicast DNS

Now from any USG network interface, you will be able to reach our Chromecast devices for casting.

What is mDNS reflector?

The reflector does as the name suggests: It will relay/repeat any Multicast traffic from the interface it was initiated on, to the interfaces you have configured on your USG.

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Grayson Adams
Systems and software engineer in Atlanta, GA, experienced in developing web applications and managing both physical and cloud-based infrastructure.

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