Draytek Vigor2926, Руководство пользователя

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Vigor2926 Series User’s Guide 170
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IGMP is the abbreviation of Internet Group Management Protocol. It is a communication
protocol which is mainly used for managing the membership of Internet Protocol multicast
groups.
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Available settings are explained as follows:
Item Description
IGMP Proxy Check this box to enable this function. The application of
multicast will be executed through WAN /PVC/VLAN port.
In addition, such function is available in NAT mode.
Interface – Specify an interface for packets passing
through.
IGMP version – At present, two versions (v2 and v3) are
supported by Vigor router. Choose the correct version
based on the IPTV service you subscribe.
General Query Interval – Vigor router will periodically
check which IP obtaining IPTV service by sending query. It
might cause inconvenience for client. Therefore, set a
suitable time (unit: second) as the query interval to limit
the frequency of query sent by Vigor router.
Add PPP header – Check this box if the interface type for
IGMP is PPPoE. It depends on the specifications regulated
by each ISP. If you have no idea to enable or disable, simply
contact your ISP providers.
IGMP Snooping Check this box to enable this function. Multicast traffic will
be forwarded to ports that have members of that group.
Disabling IGMP snooping will make multicast traffic treated
in the same manner as broadcast traffic.