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Chromecast multicast from internal to "WAN"

Hello

Actually I have a uncommon setup which look like this

Box - UTM (in DMZ) - Internal network
|
Some computers

These computers out of Internal network needs to access to internal stuff, especially chromecast speakers

Computers have route to know which gateway to use for internal IPs, FW rules works but I don't know how to find speakers

I found that chromecast use 239.0.0.250 multicast address, I tried to use "PIM SM" with internal and WAN interface, RP with UTM and chromecast

And I get this error in log

upstream neighbor for RP [IP chromecast] for group 239.0.0.250: not found

Don't know how to forward correctly multicast (also don't know if it's possible too)

Thanks in advance

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