ASP.NET获取IP的6种方法(转)

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原文转自：http://www.cnblogs.com/blodfox777/archive/2008/07/21/1247447.html

服务端：

 1 //方法一
 2 
 3 HttpContext.Current.Request.UserHostAddress; 
 4 
 5 //方法二
 6 HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
 7 
 8 //方法三
 9 string strHostName = System.Net.Dns.GetHostName();
10 
11 string clientIPAddress = System.Net.Dns.GetHostAddresses(strHostName).GetValue(0).ToString();
12 
13 //方法四（无视代理）
14 HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

客户端:

 1 //方法五
 2 var ip = '<!--#echo var="REMOTE_ADDR"-->';
 3 alert("Your IP address is "+ip);
 4 
 5 
 6 //方法六（无视代理）
 7 function GetLocalIPAddress() 
 8 { 
 9     var obj = null; 
10     var rslt = ""; 
11     try 
12     { 
13         obj = new ActiveXObject("rcbdyctl.Setting"); 
14         rslt = obj.GetIPAddress; 
15         obj = null; 
16     } 
17 
18     catch(e) 
19     { 
20     } 
21 
22     return rslt; 
23  }

另一种服务端的解决方案：

1 if(Context.Request.ServerVariables["HTTP_VIA"]!=null) // using proxy
2 {    ip=Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();  // Return real client IP.
3 }
4 else// not using proxy or can't get the Client IP
5 { 
6     ip=Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can't get the Client IP, it will return proxy IP.
7 }