puplic ip and private ip proplem ??!

#region Check IP
            // Get host name
            String strHostName = System.Net.Dns.GetHostName();
            // Find host by name
            System.Net.IPHostEntry iphostentry = System.Net.Dns.GetHostEntry(strHostName);
            // Enumerate IP addresses   
            List<string> ips = new List<string>();
            foreach (var ip in iphostentry.AddressList.Where(ip => ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork).ToArray())
            {
                if (!ips.Contains(ip.ToString()))
                    ips.Add(ip.ToString());
            }

            if (!ips.Contains(GameIP))
            {
                Console.WriteLine("Wrong IP !!!!");
                Console.WriteLine("Please Choose One from these");
                for (int i = 0; i < ips.Count; i++)
                {
                    Console.WriteLine((i + 1) + ". " + ips[i]);
                }
                var read = System.Console.ReadKey();
                int no = 0;
                if (int.TryParse(read.KeyChar.ToString(), out no))
                {
                    if (no <= ips.Count)
                    {
                        GameIP = ips[no - 1];
                        IniFile.Write("configuration", "IP", GameIP);
                    }
                }
            }
            #endregion Check IP