NetComm NB6PLUS4WN - Manual (Page 70)

NB6, NB6W, NB6Plus4, NB6Plus4W, NB6Plus4Wn User Guide YML854Rev1
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When IGMP snooping is invoked, it makes the system aware to establish the best path for multicast service to
save LAN bandwidth. Refer the figure below, just as desired, only host A and D will actually receive multicast
traffic when IGMP snooping is enabled.
While IGMP snooping is enabled, the IGMP packets will be monitored, the membership information will be
recorded and processed, and the multicast traffic will only be forwarded to those LAN interfaces, such as
Ethernet, Wireless, and USB, which are bonded to the subscribed multicast groups. Thus it helps to save the
bandwidth and helps the devices to perform more effectively.
Check Enable IGMP Snooping and click Apply to invoke this function.
If the PVC you’re using is NAT enabled, remember to turn on the IGMP Proxy at the same time. Please refer to
Internet – IGMP Proxy for more information.
Note that the IGMP proxy must be enabled first. If the IGMP Snooping function is not available as shown in the following figure, you
have to enable the IGMP Proxy first.