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.