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IGMP (Internet Group Management Protocol) proxy can be used to implement multicast routing. It works by
IGMP frame forwarding. VPN Router’s IGMP proxy supports IGMP version 2 (RFC2236). IGMP proxy
works in router mode (Layer 3); in the other hand, IGMP snooping works in bridge mode (Layer 2).
When IGMP function is “Enable”, the received IGMP packets will be forwarded to the intranet devices which
need to receive IGMP packets.