Originally Posted by zied99
My problem is that this command display this hosts and take about 28s to stop running.
28s seems about normal for this command with number of addresses, and number that are active. If you read "man fping", it will tell you the default is 3 attemps, also with a 500ms timeout, and icmp packet sending interval of 25ms.
Try adding "-r 1" for 1 retry, maybe "-i 10" for shorter interval, perhaps play with "-t n" ( where n is in ms (defaults to 500)).
Do you need to go to 192.168.1.24?, remember each address that is not live will waste approx. 1500ms.
Anyhow hopefully interpreted the manpage some for you...