Configuring Multicast DNS and IGMP across VLANs on Unifi

Since I have two VLANS, some things stop working if I am trying to use a device on one network from the other.

As an example, at the moment I have put my Sonos speakers on the IOT VLAN, but i want to be able to control that from my mobile which connects to the normal network.

Multicast DNS is what is needed to make this work.

{
"service": {
	 "mdns": {
	  "repeater": {
	   "interface": [
	    "eth1",
	    "eth1.20"
	    ]
	   }
	 }
  }
}

This means that mdns traffic from one network, will be repeated to the other.

The next thing I found I also had to enable was IGMP-Proxy.

{
  "service": {
   	"protocols": {
    	"igmp-proxy": {
    		"interface": {
      		"eth1":{
      			"alt-subnet": [
      				"0.0.0.0/0"
      			],
      			"role" : "upstream",
      			"threshold": "1"
      		},
      		"eth1.20":{
      			"alt-subnet": [
      				"0.0.0.0/0"
      			],
      			"role" : "downstream",
      			"threshold": "1"
      		}
    		}
    	}
    }
  }
}