Hello, dear friend.
The following shows how to configure IGMP on the ONT.
Click the Network Application tab and then choose IGMP Configuration from the navigation tree. In the right pane, configure the IGMP parameters, as shown in Figure 1.
Figure 1 IGMP configuration

Click Apply.
NOTE: The IGMP function of WAN ports can be enabled only when IGMP works in the gateway mode. Only when IGMP proxy is enabled in the gateway mode, parameters such as Robustness, General query interval, General query response timeout period, Group-Specific query times, Group-Specific query interval, and Group-Specific query response timeout period.
Additionally, the maximum number of igmp groups supported by the Echolife EG8120L5 is 255.
Thanks.