ASP.NET获取IP的6种方法（转载于LanceZhang's Tech Blog）

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

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

1 if(Context.Request.ServerVariables["HTTP_VIA"]!=null) // using proxy
2 { 
3      ip=Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();  // Return real client IP.
4 }
5 else// not using proxy or can‘t get the Client IP
6 { 
7      ip=Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can‘t get the Client IP, it will return proxy IP.
9 }