奇怪的获取客户端IP
1、 private string getIp()
  {/*穿过代理服务器取远程用户真实IP地址：*/
  if (Request.ServerVariables["HTTP_VIA"] != null)
  return Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
  else
  return Request.ServerVariables["REMOTE_ADDR"].ToString();
  }


2、string ip = Request.ServerVariables.Get("Remote_Addr").ToString();

用这两种方法获取客户端IP，在另外两台服务器上都正常，唯独在一台服务器上得到的是服务器的IP，怎么回事？

------解决方案--------------------
public static string GetIPAddress()
{
string result = String.Empty;

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;

}
------解决方案--------------------
不理解