ASP.NET-获取客户端IP及MAC地址

1.获取客户端IP:  

public string GetUserIP()
    {
        string _userIP;
        if(Request.ServerVariables["HTTP_VIA"] == null)
          {
              userIP= Request.UserHostAddress;
          }
        else
         {
           userIP= Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
         }
          return userIP;
     }

2.获取客户端MAC地址:   

        [DllImport("Iphlpapi.dll")]
        private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
        [DllImport("Ws2_32.dll")]
        private static extern Int32 inet_addr(string ip);

        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            try
            {
                string userip = Request.UserHostAddress;
                string strClientIP = Request.UserHostAddress.ToString().Trim();
                Int32 ldest = inet_addr(strClientIP); //目的地的ip 
                Int32 lhost = inet_addr("");   //本地服务器的ip 
                Int64 macinfo = new Int64();
                Int32 len = 6;
                int res = SendARP(ldest, 0, ref macinfo, ref len);
                string mac_src = macinfo.ToString("X");
                if (mac_src == "0")
                {
                    if (userip == "127.0.0.1")
                        Response.Write("正在访问Localhost!");
                    else
                        Response.Write("欢迎来自IP为" + userip + "的朋友！" + "<br>");
                    return;
                }

                while (mac_src.Length < 12)
                {
                    mac_src = mac_src.Insert(0, "0");
                }

                string mac_dest = "";

                for (int i = 0; i < 11; i++)
                {
                    if (0 == (i % 2))
                    {
                        if (i == 10)
                        {
                            mac_dest = mac_dest.Insert(0, mac_src.Substring(i, 2));
                        }
                        else
                        {
                            mac_dest = "-" + mac_dest.Insert(0, mac_src.Substring(i, 2));
                        }
                    }
                }

                Response.Write("欢迎来自IP为" + userip + "<br>" + ",MAC地址为" + mac_dest + "的朋友！"

                 + "<br>");
            }
            catch (Exception err)
            {
                Response.Write(err.Message);
            }
        }

3.在ASP.NET中得到的方法：

    获得服务器电脑名称：Page.Server.ManchineName

            获取用户信息：Page.User

            获得客户端电脑名称：Page.Request.UserHostName

            获得客户端电脑IP：Page.Request.UserHostAddress

                             Page.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]

                             Page.Request.ServerVariables["REMOTE_ADDR"]