ASP.NET获取IP的6种方法

//方法一
HttpContext.Current.Request.UserHostAddress;

//方法二
HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

//方法三
string strHostName = System.Net.Dns.GetHostName();
string clientIPAddress = System.Net.Dns.GetHostAddresses(strHostName).GetValue(0).ToString();

//方法四（无视代理）
HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

//方法五
var ip = '<!--#echo var="REMOTE_ADDR"-->';
alert("Your IP address is "+ip);

//方法六（无视代理）
function GetLocalIPAddress()
{
var obj = null;
var rslt = "";
try
{
obj = new ActiveXObject("rcbdyctl.Setting");
rslt = obj.GetIPAddress;
obj = null;
}
catch(e)
{
//
}

return rslt;
}

if(Context.Request.ServerVariables["HTTP_VIA"]!=null) // using proxy
{
ip=Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();  // Return real client IP.
}
else// not using proxy or can't get the Client IP
{
ip=Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can't get the Client IP, it will return proxy IP.
}