static void Main(string[] args)        {           Console.WriteLine(IsAliyunInsideNetwork());           Console.WriteLine(Ping("oss-cn-qingdao.aliyuncs.com"));           Console.ReadKey();        }        /// 
        /// 功能：判断本机是不是阿里云内网        /// 作者：黄海        /// 时间：2018-06-13        /// 
        /// 
             public static bool IsAliyunInsideNetwork()        {            return Ping("oss-cn-qingdao-internal.aliyuncs.com");        }        /// 
        /// 是否能 Ping 通指定的主机        /// 
        /// ip 地址或主机名或域名        /// 
     
      true 通，false 不通
             public static bool Ping(string ip)        {            var p = new System.Net.NetworkInformation.Ping();            var options =                new System.Net.NetworkInformation.PingOptions {DontFragment = true};            var data = "Test Data!";            var buffer = Encoding.ASCII.GetBytes(data);            const int timeout = 1000; // Timeout 时间，单位：毫秒            var reply = p.Send(ip, timeout, buffer, options);            return reply != null && reply.Status == System.Net.NetworkInformation.IPStatus.Success;        }