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IP address of client from MVC ASP.net application

What is the best foolproof way of getting client IP address for the client who is behind firewall, proxy or load balancer in ASP.net to harden the security of the site?
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Jugnoo2013
Asked:
Jugnoo2013
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1 Solution
 
Dave BaldwinFixer of ProblemsCommented:
If this is on the public internet, the only thing you can get is their public IP address.  It's reported in the server variables under REMOTE_ADDR.

This simple program reports all the server variables available on your server.  REMOTE_ADDR is added separately at the bottom.
<%@ Page Language = "VBScript" AspCompat="True" %>
<% Response.Buffer = true %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<title>ASPX .NET Server Variables</title>
</head>
<body>
<h1 align="center">ASPX .NET Server Variables</h1>
<%
Dim loop1, loop2 As Integer
Dim arr1(), arr2() As String
Dim coll As NameValueCollection

' Load ServerVariable collection into NameValueCollection object.
coll=Request.ServerVariables 
' Get names of all keys into a string array.
arr1 = coll.AllKeys 
For loop1 = 0 To arr1.GetUpperBound(0)
   Response.Write("<b>" & arr1(loop1) & "</b>: ")
   arr2 = coll.GetValues(loop1) ' Get all values under this key.
   For loop2 = 0 To arr2.GetUpperBound(0)
      Response.Write("Value " & CStr(loop2) & ": " & Server.HtmlEncode(arr2(loop2)) & "<br>")
   Next loop2
Next loop1

Response.Write ("<br>" & vbCrLf)
Response.Write ("REMOTE_ADDR" & ": " _
	& Request.ServerVariables("REMOTE_ADDR") _
	& "<br>" & vbCrLf)

%>

</body>
</html>

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Jugnoo2013Author Commented:
Thanks, I will take a look. Does same hold true for intranet sites?
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Dave BaldwinFixer of ProblemsCommented:
Intranet clients will show their intranet IPs as long as there is no proxy in between you and them.
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