A table defining the networks associated with filters to create
the firewall policy rules. Networks can be defined with a
network IP address and mask, an IP address range, or a single
IP host address.
The implementation may choose to allow modifications to this
table only under certain SNMP contexts. The
etsysFWNetworkStorageType for a given SNMP context may be
readOnly, meaning the row cannot be modified or deleted. In
another SNMP context, the etsysFWNetworkStorageType value could
allow the row to be modified or deleted.