BEETEL 450TC3, Руководство пользователя

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5.2 Service
5.2.1 IGMP proxy
IP hosts use Internet Group Management Protocol (IGMP) to report their multicast group
memberships to neighbor routers. Similarly, multicast routers use IGMP to discover which of their
hosts belong to multicast group. The router supports IGMP proxy that handles IGMP message.
When enabled, the router will act as a proxy for a LAN host making request to join and leave
multicast groups, and a multicast router sending multicast packets to multicast groups on WAN
side,
Go to Service->IGMP page, you can configure the IGMP proxy. Here you can enable or disable
the IGMP proxy function on all WAN interface, and you can also set the parameters of the IGMP
function.
5.2.3 DNS
Go to Service->DNS page, you can configure the IP address of DNS server for DNS Relay.