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Mention docker host network is required to use cast (#13246)

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Erik Montnemery 2020-05-01 23:28:45 +02:00 committed by GitHub
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source/_integrations/cast.markdown
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@ -64,11 +64,15 @@ media_player:
type: list
{% endconfiguration %}
### Cast devices and Home Assistant on different subnets
### Docker and Cast devices and Home Assistant on different subnets
Cast devices can only be discovered and connected to if they are on the same subnet as Home Assistant. If this is not the case, it's necessary to:
Cast devices can only be discovered and connected to if they are on the same subnet as Home Assistant.
When running Home Assistant Core in a [Docker container](/docs/installation/docker/), the command line option `--net=host` or the compose file equivalent `network_mode: host` must be used to put it on the host's network, otherwise the Home Assistant Core will not be able to connect to any Cast device.
Setups with cast devices on a different subnet than Home Assistant are not recommended and not supported.
If this is not possible, it's necessary to:
- Enable mDNS forwarding between the subnets.
- Enable source NAT to make requests from Home Assistant to the Chromecast appear to come from the same subnet as the Chromecast.
Setups with cast devices on a different subnet than Home Assistant are not recommended and not supported.