D-Link DSL-2750B User Manual page 78

Section 3 - Configuration
IGMP
Transmission of identical content, such as multimedia, from a source to a
number of recipients.
Check the box to Enable IGMP Snooping
Click on the Apply button to save settings.
QoS
Quality of Service is a feature that allows you to allocate or guarantee the
throughput or speed of Internet for certain computer.
Check the box to enable/disable the QoS.
Click Save/Apply to take the setting effect.
D-Link DSL-2750B User Manual 78