Foro de elhacker.net

var ippublica = new System.Net.WebClient().DownloadString("http://misitioweb.com/ip.php");
IPAddress direc = Dns.Resolve(ippublica).AddressList[0];
_tcpListener = new TcpListener(IPAddress.Parse(direc), port);
                _tcpListener.Start();
                _acceptThread = new Thread(AceptarClientes);
                _acceptThread.Start();

 var ippublica = new System.Net.WebClient().DownloadString("http://misitioweb.com/ip.php");
            IPAddress direc = Dns.Resolve(ippublica).AddressList[0];//Dns.GetHostEntry("localhost").AddressList[0];
            IPEndPoint Ep = new IPEndPoint(direc, 12345);
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            socket.Bind(Ep);
            socket.Listen(100);
            Socket handler = socket.Accept();