The location of the contained network. The MIB defines the
following tables which may be pointed to by this column:
etsysFWNetworkTable
Implementations should prevent recursion and return the
inconsistentName exception if the SnmpAdminString value
references an etsysFWNetworkGroupTable row that already
contains the etsysFWNetworkGroupName of this row.
If this column is set to a SnmpAdminString value which
references a non-existent row in an otherwise supported
table, the inconsistentName exception should be returned.
If the table or scalar pointed to by the SnmpAdminString is
not supported at all, then an inconsistentValue exception
should be returned.