D-Link DSL-2740B User Manual page 75

Section 3 - Configuration
IGMP
Transmission of identical content, such as
multimedia, from a source to a number of
recipients.
Check the Enable IGMP Snooping checkbox to
enable IGMP snopping function.
QoS
Quality of Service is a feature that allows you to
prioritize the upstream traffics and optionally,
mark the IP headers.
Click the Add button to set QoS setting.
D-Link DSL-2740B User Manual 75