@dissent1, @nbd, @blogic, @gcobb or anyone else who knows their way in the switch driver, I need some assistance. On the R7800, whenever IGMP snooping is enabled on the switch, all IGMP queries (but not reports) ends up at eth0 (port 0 on the switch chip). This renders multicasting useless, since the queries from the server (which is not in WAN) never reach the clients (which are also not on eth0/WAN). I believe this has to be a bug in the switch configuration. All the details in this thread.