ZyXEL Communications P-660R-Tx v3 Series Support Notes page 56

P-660R-Tx v3 Series Support Notes
permanent IP hosts group, and 224.0.0.2 is assigned to the multicast routers
group.
IGMP (Internet Group Management Protocol) is the protocol used to support
multicast groups. The latest version is version 2 (see RFC2236). IP hosts use
IGMP to report their multicast group membership to any immediate-neighbor
multicast routers so the multicast routers can decide if a multicast packet
needs to be forwarded. At start up, the P-660R-Tx v3 queries all directly
connected networks to gather group membership.
After that, the P-660R-Tx v3 updates the information by periodic queries. The
P-660R-Tx v3 implementation of IGMP is also compatible with version 1. The
multicast setting can be turned on or off on Ethernet and remote nodes.

IP Multicast Setup
(1) Enable IGMP in P-660R-Tx v3's LAN in Web Configurator, Advanced
Setup, Interface Setup -> LAN -> Router Local IP
(2) Enable IGMP in P-660R-Tx v3's remote node in Web Configurator,
Advanced Setup, Interface Setup -> Internet -> Dynamic IP
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