Asp.Net获取IP的方法

服务端：

//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().ToString();

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

客户端：

//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;
} 

用的比较广的：

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.
}