![]() If a ping fails, the next ping request is sent after a State Check Interval ( 3 sec in the example). The program continuously monitors a host by sending ping echo requests on a regular basis at a Regular Pings Interval ( 10 sec in the example). Below you can see an example of a host monitoring sequence to understand how monitoring works and what parameters are used in the monitoring configuration. However, if several pings fail in a row, it means that there is a problem and the host state should be changed to Down.Īll the monitoring parameters used by the program are configurable and can be changed if required. A single failed ping usually doesn't indicate a problem, because pings can fail sometimes even for properly working hosts. ![]() If pings fail, it means that the monitored host isn't reachable. How does the program detect the host states using pings? If pings pass successfully, it means that the host works, so it has the Up state. The Down state means that the monitored host is unreachable and it doesn't reply to ping requests. The Up state means that the monitored host works and replies to ping requests. One of the main goals of Ping Monitor is helping you to detect problems with the monitored hosts automatically, so the program continuously monitors the hosts to detect their current state. It happens when the pinged host or the network infrastructure is overloaded and ping requests cannot be processed in time. Usually, a ping fails when its round-trip time exceeds the configured timeout. What is the reason for ping failure? A ping can fail due to different reasons, for example, when the pinged host is turned off, when there is a network problem between the source and destination, or when there is a DNS problem and the host name cannot be resolved to the correct IP address. If pings fail, it means that there is no connection between the program (the Ping Monitor server that sends pings) and the monitored host. When there is no echo reply from the host, the ping is considered as failed. ![]() When the program sends a ping echo request and gets a reply from the host, the ping is considered as passed, and the program saves its round-trip time. Echo requests, which are called pings, are sent on a regular basis at particular time intervals, so the program continuously interacts with the host and can detect the moment when it stops replying to ping requests. The program sends ICMP echo requests to a monitored host and analyzes its echo replies. Every host is monitored independently from other hosts to guarantee a high monitoring performance. The program uses the ICMP protocol to monitor hosts over a network. The technical limit of the program is 32,000 hosts. You can monitor 8,000+ hosts on modern hardware. The practical limit of monitored hosts depends on the used hardware. The Enterprise edition doesn't limit the number of hosts. The Free edition allows monitoring of up to five hosts, and the Professional edition allows monitoring of up to 250 hosts. The number of monitored hosts depends on the program license. The program is designed for simultaneous monitoring of multiple hosts.
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