How do I enable multicast to allow communication to Google Chromecast across VLANs?

Question

Hello, 
 I am new to Sophos XG and networking in general. I am attempting to set up Sophos XG on my home network so I can isolate my devices into separate VLANs. So far the setup has been going well but I have run into an issue with communicating (casting) to my Google Home and ChromeCast devices when they are on a separate VLAN. I have been doing some research and it seems this is related to multicasting being blocked across subnets. I have searched the forums and it seems other people are having this issue but I haven't been able to find a solution. 
 Has anyone been able to get this to work? If so, would you mind posting your configuration? 
 Things I have tried: 
 
 Enabled Multicast forwarding 
 Set up a multicast route (although I'm not sure I did this correctly) 
 Enabled Dynamic Routing for both my LAN and VLAN 
 Created firewall rules that would allow all traffic from LAN to VLAN and VLAN to LAN 
 Tried to set up Multicast(PIM-SM) but I'm not sure if this is where I need to be or if I did it correctly. 
 
 Thanks in advance! 
 Pete

Jaydeep · Accepted Answer

Hi Pete B1 
 In order to allow Chromecast to work smoothly in your network, you might require the following rules for the Chromecast device: 
 
 Allow high UDP ports both incoming and outgoing. "High ports" are the local ports usually ranging 32768-61000. 
 Allow both TCP ports 8008 and 8009 outbound to the Chromecast device. 
 Allow the special SSDP packets outbound (which is UDP traffic to the multicast IP 239.255.255.250, destination port 1900) which is used to check for other Google devices in the same network. Google devices reply with the Source IP to this packet. 
 
 This should allow you to work your Google Home and Chromecast in different VLANs. Ideally, I'd suggest to keep it in the same VLAN.