Well just that. I am not sure whether they are correct.
Local link multicasts are in the address range 126.96.36.199/24. So I’d set the rules like that. And then there is normal unicast traffic targeted to the firefly server, so that needs to be open as well. Anyway, set your iptables to allow all, and then have a go with tcpdump or $your_fave_network_eavesdropping_tool and you’ll see 😉