OPNsense: Access AppleTV from different VLAN

I recently bought a new AppleTV, which I tried to integrate with HomeAssistant today.

Since the AppleTV is on a different VLAN than my HomeAssistant, I created an appropriate firewall rule, but HomeAssistant still could not find the AppleTV.

After a long search I found out that I also need to enable mDNS and create an additional firewall rule.

So all in all I did the following to make it work:

1. Install and configure Multicast DNS Proxy
2. Create first firewall rule:
   • Action: Pass
   • Interface: DMZ
   • Direction: in
   • TCP/IP Version: IPv4+IPv6
   • Protocol: any
   • Source: HomeAssistant (this is an alias for my Homeassistant ip)
   • Destination: AppleTV (alias)
   • Description: Allow HomeAssistant access to AppleTV
3. Create second firewall rule:
   • Action: Pass
   • Interface: DMZ
   • Direction: in
   • TCP/IP Version: IPv4
   • Protocal: any
   • Source: HomeAssistant (alias)
   • Destination: Single host or Network: 224.0.0.251/32
   • Description: Allow HomeAssistant access to Bonjour (for AppleTV)
4. Restart HomeAssistant.