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Correct google cast documentation (#38074)

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Erik Montnemery 2025-03-19 13:50:27 +01:00 committed by GitHub
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source/_integrations/cast.markdown
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@ -54,9 +54,11 @@ Home Assistant Cast requires your Home Assistant installation to be accessible v
{% note %}
Chromecasts generally ignore DNS servers from DHCP and will instead use Google's DNS servers, 8.8.8.8 and 8.8.4.4. This means media URLs must either be specifying the IP-address of the server directly, e.g. `http://192.168.1.1:8123/movie.mp4`, or be publicly resolvable, e.g. `http://homeassistant.internal.mydomain.com:8123/movie.mp4` where `homeassistant.internal.mydomain.com` resolves to `192.168.1.1`. A hostname which can't be publicly resolved, e.g. `http://homeassistant.local:8123/movie.mp4` will fail to play.
Chromecasts generally don't resolve hosts through mDNS and also ignore DNS servers from DHCP, they instead use Google's public DNS servers, 8.8.8.8 and 8.8.4.4.
This is important when casting TTS or local media sources; the cast integration will cast such media from the `external_url` if [configured](/integrations/homeassistant/#editing-the-general-settings-in-yaml), otherwise from the Home Assistant Cloud if configured, otherwise from the [`internal_url`](/integrations/homeassistant/#editing-the-general-settings-in-yaml). Note that the Home Assistant Cloud will not be used if an `external_url` is configured.
This means media URLs must either be specifying the IP-address of the server directly, e.g. `http://192.168.1.1:8123/movie.mp4`, or be publicly resolvable, e.g. `http://homeassistant.internal.mydomain.com:8123/movie.mp4` where `homeassistant.internal.mydomain.com` resolves to `192.168.1.1` using Google's DNS servers. A hostname which can't be publicly resolved, e.g. `http://homeassistant.local:8123/movie.mp4` will fail to play.
This is important when casting TTS or local media sources; the cast integration will cast such media from the local Home Assistant URL, which can be configured by navigating to **{% my network title="Settings > System > Network" %}** or by configuring an [`internal_url`](/integrations/homeassistant/#editing-the-general-settings-in-yaml).
{% endnote %}