Netcom manual Enable Igmp Snooping, Table entry, Through your NB9/NB9W

Enable IGMP Snooping	IGMP specifies how a host can register a router in order to receive specific multicast traffic.
	IGMP Snooping allows the NB9/NB9W to capture IGMP frames. When your NB9/NB9W
	hears an IGMP report from a host for a given multicast group it adds the host’s port number
	for that group. When the NB9/NB9W hears an IGMP Leave, it removes the host’s port from
	the table entry.
	Without IGMP snooping, multicast traffic is treated in the same manner as broadcast traffic
	- that is, it is forwarded to all ports. With IGMP snooping, multicast traffic of a group is
	only forwarded to ports that have members of that group. IGMP Snooping generates no
	additional network traffic, allowing you to significantly reduce multicast traffic passing
	through your NB9/NB9W.
Save	Save the settings.
Save / Reboot	Save and reboot with the settings applied.

NB9/NB9W ADSL2+ VoIP Router	47
YML790 Rev8