The IGMPLevel property indicates the extent to which the system supports IP multicast and participates in the Internet Group ...

The IGMPLevel property indicates the extent to which the system supports IP multicast and participates in the Internet Group Management Protocol. At level 0, the system provides no multicast support. At level 1, the system may only send IP multicast packets. At level 2, the system may send IP multicast packets and fully participate in IGMP to receive multicast packets. Default: 2