You left out what protocol to use... try this snippet

#!/perl/bin/perl -w

use strict;
use Net::Ping;

my $host = "127.0.0.1";
my $ping=Net::Ping->new("icmp");
if ($ping->ping($host,1)){
    print "$host is alive";
}else{ print "$host unreachable" }
[download]

Update: added else statement

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