Network Secure does not forward multicast traffic. For the Network Secure to indicate forwarding multicast traffic, you need to configure multicast routes to forward multicast routes, as shown in the following figure.

Click Add, and the figure below will appear.

Source Address: source address of multicast data.

Multicast Address: the destination address of multicast packets.

Source Interface: the source interface on the host sending the multicast data.

Destination Interface: the interface forwards the multicast traffic(you can select multiple interfaces).