check_tping

check_tping is a C language plugin used to probe and determine host and network responsiveness by forming TCP connections. This is useful when ICMP may be blocked or treated with a lower priority, making it either entirely useless or untrustworthy as a measurement tool. While other TCP ping tools/plugins exist, the approach used here minimizes total runtime, and allows for an adjustable interprobe delay. This essentially creates a pipeline of probes, limiting the total runtime to Number of probes * Interprobe delay + timeout, rather than a sequential Number of probes * timeout approach. This makes check_tping optimal for use in a busy Nagios server environment where hundreds or thousands of hosts/services are being monitored. This work is derived from Amgad Zeitoun's HTPing, and as such carries a University of Michigan copyright notice.

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