Chromecast across VLANs

I'd like to enable clients on other VLANs (subnets) to be able to cast to a Chromecast on one particular subnet.

I've tried the Guest mode on the Chromecast, but guest users have had no luck in connecting for some reason.

I know that the Chromecast advertises its availability via Multicast but once a device is connected, communication is via unicast.

So two questions:
Unicast - I'm comfortable with configuring appropriate firewall rules, but need to know what protocols/ports to allow in which direction. I've tried to find online but no luck so far.
Multicast - I've never configured it before, but I know my router (Mikrotik RouterOS) supports it. I've read their wiki article on Multicast, but still a little unsure exactly how to configure.
https://wiki.mikrotik.com/wiki/Manual:Routing/Multicast
https://wiki.mikrotik.com/wiki/Manual:Multicast_detailed_example

I plan to add a DHCP reservation for the Chromecast on its existing subnet, 10.5.0.0/16 (10.5.2.x) and would like to allow clients on 10.6.1.0/24 and 10.9.2.0/24 to connect.

Any help appreciated. Thanks!
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Stuart OramIT Technical Lead (Project Sites)Asked:
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RoohAllah GodazgarIT ConsultantCommented:
These are the exact ports that Chromecast is using (according to this link):
To connect to external devices:
    HTTP:  TCP/80
    HTTPS:  TCP/443
    DNS:  UDP/53
    SNTP:  UDP/123
Chromecast communication ports:
    SSDP:  UDP/1900/multicast
    mDNS:  UDP/5353/multicast
    TCP/8008
    TCP/8009
Since you are using MikroTik as your router and your Chromecast  is in a different subnet than your clients, you should open these ports (all of them or some of them according to your needs) in Firewall section. To do this you can accept these ports in "Filter Rules", "Forward" chain or DST-NAT them in "NAT" section, "des-nat" chain.
Also if you've configured your network to isolate clients, you may need to reconfigure this section (Isolation is common in wireless configuration).
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Stuart OramIT Technical Lead (Project Sites)Author Commented:
Not had a chance to test this yet, but closing out as it's been listed as abandoned for some time.
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