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The subnetwork mask address does not include the natural mask address.

Source:  FLTCFG

Explanation:  The natural mask address is not automatically entered. The subnetwork mask should contain at least the natural mask bits set for the specified class of the IP address.

Action:  Use NIASCFG to check that you added the natural mask address. Enter the subnetwork mask address with the natural mask bits set.

  Previous Page: The network or host address must be a valid class A, B, or C IP address.  Next Page: The subnetwork mask must have contiguous network bits set. The bits in the subnetwork mask mask, are not contiguous.