I am not sure why the code terminates, however I do have a comment about your code.
You open a handle to the log file each time you process a host from your @hostnames array. Perhaps you could look at opening the file handle once before processing the entire array. Also you may want to only sleep after the foreach...
my @hostnames = ("10.0.0.1", "10.0.0.2");
my $p = Net::Ping->new("icmp");
print "\nWriting data to ping.log\n";
print "Press CTRL-C to exit\n";
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");
These changes will not affect you unless you @hostnames array grows to more than 1 host though.
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