外网得到客户端IP和MAC地址

public class GetMac
{
[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);

//获取客户IP地址#region 获取客户IP地址
public static string GetClientIP()
{
string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (null == result || result == String.Empty)
{
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}

if (null == result || result == String.Empty)
{
result = HttpContext.Current.Request.UserHostAddress;
}
return result;
}

//获取客户MAC地址#region 获取客户MAC地址
public static string GetClientMac(out string Tmp_ClientIP, out string Tmp_ClientMac)
{
Tmp_ClientIP = "";
Tmp_ClientMac = "";
try
{
string strClientIP = GetClientIP();
Int32 ldest = inet_addr(strClientIP); //目的地的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 (strClientIP == "192.168.0.88")
Tmp_ClientIP = "本地测试";
else
Tmp_ClientIP = strClientIP;
//return;
}

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

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

}

}

--------------------------------------------------------调用方法得到IP和MAC地址----------------------------

string Tmp_ClientIP = "";
string Tmp_ClientMac = "";
GetMac.GetClientMac(out Tmp_ClientIP, out Tmp_ClientMac);