If you check Enable IGMP Proxy only, you will get the following page. All the multicast
groups will be listed and all the LAN ports (P1 to P4) are available for use.
If you check Enable IGMP Snooping only, you will get the following page. Though all the
multicast groups are listed, yet all the LAN ports (P1 to P4) are not available for use.
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Vigor2700 Series User's Guide