winform 的socket 疑问

Question

port = 9999;
            ip = "222.73.40.208";
            IPAddress ipaddress = IPAddress.Parse(ip);
            IPEndPoint address = new IPEndPoint(ipaddress, port);
          
            IPEndPoint ep = new IPEndPoint(0, 6565);
            client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            
           
          
            //LocalEP.Port = 6666;            client.Bind(ep);
            client.Connect(address);
           
           string sendstr = "CONN";
                      byte[] bs = Encoding.ASCII.GetBytes(sendstr);
            client.Send(bs, bs.Length, 0);   这样写有什么问题呢。为什么服务端看到还是随机IP

Answer 1

如果服务器和客户端之间经过了路由NAT地址转化，看到的就不是客户端的ip

Answer 2

http://hi.baidu.com/jiang_yy_jiang/blog/item/3bf0f9fa75c7c913a9d31144.html