check_ping

[normal]
127.0.0.1 100 100 1000 1000 -p 1
PING ok - Packet loss = +[0-9]{1,2}\%, +RTA = [\.0-9]+ ms

[critical]
127.0.0.1 0 0 0 0 -p 1
Packet loss = +[0-9]{1,2}\%, +RTA = [\.0-9]+ ms

[critical]
$nullhost 0 0 0 0 -p 1 -to 1
CRITICAL - Plugin timed out after 1 seconds