Javadoc
If source ranges are specified, the firewall will apply only to traffic that has source IP
address in these ranges. These ranges must be expressed in CIDR format. One or both of
sourceRanges and sourceTags may be set. If both properties are set, the firewall will apply to
traffic that has source IP address within sourceRanges OR the source IP that belongs to a tag
listed in the sourceTags property. The connection does not need to match both properties for
the firewall to apply. Only IPv4 is supported.