This counts packets dropped because no matching route was found for their destination address. A rising count here is a direct, actionable signal that the route table, configured via the various cdmipIpRoute objects, is missing an entry for some destination that traffic is actually trying to reach, distinguishing a routing-configuration gap from any of the other, more physical-layer-related drop reasons. A remote site that just added a new subnet locally, without an admin adding a corresponding route on this modem, would see this counter start climbing as traffic destined for that new subnet finds no matching route.