fping is a ping like program which uses the Internet Control Message
    Protocol (ICMP) echo request to determine if a host is up. fping is
    different from ping in that you can specify any number of hosts on
    the command line, or specify a file containing the lists of hosts to
    ping. Instead of trying one host until it timeouts or replies, fping
    will send out a ping packet and move on to the next host in a
    round-robin fashion. If a host replies, it is noted and removed from
    the list of hosts to check. If a host does not respond within a
    certain time limit and/or retry limit it will be considered unreachable.