use strict;

use Time::Local;
use Net::Ping;

my ($time);
my @hostnames    = ("10.0.0.1", "10.0.0.2");
my $p        = Net::Ping->new("icmp");
my $hostname;

 print "\nWriting data to ping.log\n";
 print "Press CTRL-C to exit\n";

while(1)
{
    open (LogFile, ">>ping.log") || die "Sorry, cannot open logfile\n";

    foreach my $hostname (@hostnames)
    {
        $time = localtime;
        print (LogFile "$time - ");
        print (LogFile "$hostname is ");
        print (LogFile "NOT ") unless $p->ping($hostname, 2);
        print (LogFile "reachable.\n");
     }
     close Logfile;
     sleep(5);    
}