Multicast Source Specific Address Space Tab • Network > Virtual Router > Multicast > Source Specific Address Space Add the multicast groups that can receive multicast packets from a specific source only. These are the same multicast groups and names that you specified as Source Specific on the Multicast > Interfaces > Group Permissions tab. Multicast Settings – Source Specific Address Space Description Name Identify a multicast group for which the firewall provides source-specific multicast (SSM) services. Group Specify a multicast group address that can accept multicast packets from a specific source only. Included Select to include the multicast group in the SSM address space. Parent topic IP Multicast