6.2 Reachability Test with Ping
The classic reachability test in UNIX systems has always been a ping, which sends an ICMP echo request packet and waits for an ICMP echo response packet. The Nagios plugin package includes two programs that carry out this ping check: check_icmp and check_ping. Even though check_ping is used in the standard configuration, you should replace it with the more efficient check_icmp, which has been included since plugin version 1.4.
Whereas check_ping calls the UNIX program /bin/ping, which is why there are always compatibility problems with the existing ping version, check_icmp sends ICMP without any external help programs. check_icmp basically works more efficiently, since it does not wait for one second between individual ...
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