This counter aggregates packets dropped for any of twenty distinct internal reasons enumerated in the MIB, including boot-time filtering, flow descriptor mismatches, access control rejections, Vipersat multicommand/unicommand issues, bad packet structure, and more. Because it lumps together so many unrelated causes, a rising count here tells an admin only that 'something in this broad category' is happening, and pinpointing the actual reason typically requires the unit's local diagnostic/event log rather than SNMP alone. For example, an admin enforcing an access control list on the router might see this counter climb every time an unauthorized management station attempts to reach the unit, alongside unrelated drops from Vipersat multicast command frames being filtered.