IGMP Proxy Chromecast, I'm lost

[ezra55]

Hey guys,

I want to be able to use my chromecasts (and home automation server) auto discovery and use it like everything is on 1 subnet. which it isnt of course.

I have multiple vlans containing clients that need access to my chromecast vlan.

Now reading up on IGMP Proxy, it only confuses me more.

Like: what to set as upstream? I dont think this needs to be WAN? I just want to use this locally, what subnets need to be in the upstream, only the chromecast vlan?

And what to set as downstream: vlans that need access to it?

Also can this be used for Wake On Lan accross subnets?

Thanks

edit: also have Mdns enabled on all vlans