#!/usr/bin/perl
use IO::Socket;
use Net::Ping;
$sock = new IO::Socket::INET (LocalHost => 'xxx.xxx.xxx.xxx', LocalPort => 9321, Proto => 'tcp', Listen => 5, Reuse => 1 );
die "Socket could not be created. Reason: $!" unless $sock;
$reach = Net::Ping->new($ > ? "tcp": "icmp");
(defined $reach) or die "Couldn't create Net::Ping object: $!\n";

while (1) {
  do a poll or select on Server socket Id which is '$sock';
  whenever there is a new connection 'send_response'
  send_response ( $new_sock );
}

sub send_response {
	my ( $new_sock ) = shift;
	if $reach->ping("$host") {
		print "host is reachable"
	} else {
		print "host is unreachable";
	}

	return 1;
}