This read-only Counter64 counts queries discarded because they carried a source IP address of 0.0.0.0. A 0.0.0.0 source is normally only valid for a router's very first query before it has an address, so a steady count of these on an established link usually flags a misbehaving or spoofing querier rather than normal startup behavior; because it is drawn from the lifetime bin, which keeps accumulating until an operator explicitly clears it, a sudden plateau on an otherwise busy instance is itself a signal — most likely that someone cleared the stats rather than that traffic actually stopped. On a residential VLAN used for multicast video delivery, a count of 2,738 over the 61 days since the counters were last cleared is the kind of number an admin would trend against the join/leave rate on the same port to judge whether it's normal channel-surfing or an anomaly worth a closer look.