User manual

Section 3 - Configuration
D-Link DSL-2740U User Manual
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Enter the Group name and select interfaces from the available
interface list and add it to the grouped interface list using the
arrow buttons to create the required mapping of the ports. The
group name must be unique.
Click the Apply button to set Port Mapping setting.
IGMP
Transmission of identical content, such as multimedia, from a source
to a number of recipients.