一个与UdpClient有关的问题，会的进来帮忙，，

private void rmessage()
         {
             IPEndPoint remote = new IPEndPoint(IPAddress.Any, 8002);
             udp = new UdpClient(remote);
             iep = new IPEndPoint(IPAddress.Any, 0);
             while (true)
             {
                 try
                 {
                     bytes = udp.Receive(ref iep);
                 }
                 catch
                 {
                     MessageBox.Show("error");
                     return;
                 }
                 finally
                 {
                 }
                 str = Encoding.UTF8.GetString(bytes);
                 textBox1.Text = str;
             }
         }
问：为什么要两个IPEndPoint 的对象，两个对象的作用分别是什么 ，