A source entry has exactly one of these attributes:
address=“address[/mask]” - The source is either an IP address or a network IP address with a mask for IPv4 or IPv6. The network family (IPv4/IPv6) will be automatically discovered. For IPv4, the mask can be a network mask or a plain number. For IPv6 the mask is a plain number. The use of host names is not supported.
mac=“MAC” - The source is a MAC address. It must be of the form XX:XX:XX:XX:XX:XX.