Edimax Technology AR-7266WNA - Manual (Page 86)

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When you finish, click ‘Apply Changes’. You’ll see the following message
displayed on web browser:
Press ‘Continue’ to save the settings made and back to web management
interface; press ‘Apply’ to save the settings made and restart the router so the
settings will take effect after it reboots.
5.2.6.4. IGMP Proxy
When “IGMP Proxy” (Internet Group Management Protocol Proxy) is enabled, the
router can make intelligent multicast forwarding decisions by examining the
contents of each frame’s IP header. Without the function, the router will
broadcast the multicast packets to each port and may create excessive traffic on
the network and degrade the performance of the network.
The IGMP Proxy page allows you to enable multicast on WAN and LAN
interfaces. The LAN interface is always served as downstream IGMP proxy, and
you can configure one of the available WAN interfaces as the upstream IGMP
proxy. Upstream is the interface that IGMP requests from hosts are sent to the
multicast router. Downstream is the interface data from the multicast router are
sent to hosts in the multicast group database.