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_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.
check_ping calls the UNIX program
/bin/ping, which is why there are always compatibility problems with the existing
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 ...