This read-only Counter32 counts IP ping frames, ICMP Echo Request or Echo Reply, observed on the monitored segment's ICMP/IP traffic during this 15-minute long-term sample, with 4294967294 meaning unknown. An admin watches this counter to gauge how much of the traffic on the monitored segment's ICMP/IP traffic is basic reachability testing, and to notice an unusual surge that might indicate a ping sweep or misbehaving monitoring tool. For example, a sudden large jump in Ping counts on the monitored segment's ICMP/IP traffic during a 15-minute long-term sample, with no known monitoring change, could indicate someone running a network discovery scan against the segment.