Orbi 37x and Local Network Control Block (224.0.0/24) multicast

The host router carries all traffic he has to carry, i.e intranet/internet traffic.

Host A & B are RPIs or MacOS depending on the tests I carried on.

Host A & B are WiFi connected to the same Orbi kit (being RBR or RBS depending on the tests I carried on)

Host A can communicate with host B in my LAN as well as other hosts in my LAN using many network protocols

Host B can communicate with host A in my LAN as well as other hosts in my LAN using many network protocols

ARP table of host A shows host B MAC address

ARP table of host B shows host A MAC address

Host A and host B can communicate with any Internet host through the FAI router, from which they get their IP address via DHCP

Host A multicast packets sent to 224.0.0.234 are not received by any hosts in my LAN, including host B

Host B multicast packets sent to 224.0.0.234 are not received by any hosts in my LAN, including host A

If Host A & B are connected to the same Netgear switch, itself wired to a RBS, then they can see multicast packets from each other