11.1.1 General
In the Multicast->General->General menu you can disable or enable the multicast func-
tion.
The Multicast->General->General menu consists of the following fields:
Fields in the Basic Settings menu
Field
Description
Multicast Routing
Select whether Multicast Routing should be used.
The function is enabled with
"
.
The function is disabled by default.
11.2 IGMP
IGMP (Internet Group Management Protocol, see RFC 3376) is used to signal the inform-
ation about group (membership) in a subnet. As a result, only the packets explicitly
wanted by a host enter the subnet.
Special mechanisms ensure that the requirements of the individual clients are taken into
consideration. At the moment there are three versions of IGMP (V1 - V3); most current
systems use V3, and less often V2.
Two packet types play a central role in IGMP: queries and reports.
Queries are only transmitted from a router. If several IGMP routers exist in a network, the
router with the lowest IP address is the "querier". We differentiate here between a general
query (sent to 224.0.0.1), a group-specific query (sent to a group address) and the group-
and-source-specific query (sent to a specific group address). Reports are only sent by
hosts to respond to queries.
11.2.1 IGMP
In this menu, you configure the interfaces on which IGMP is to be enabled.
11.2.1.1 Edit or New
Choose the
icon to edit existing entries. Choose the New button to configure IGMP on
other interfaces.
Gigaset Communications GmbH
11 Multicast
hybird 120 Gigaset Edition
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