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POphp / ajax REMOTE_ADDR set to IP of bogus network adapter
 

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    <p>today I came a across a pretty strange behaviour of an php based application of mine. In a certain part of the system there's an UI making use of AJAX-calls to fill list boxes with content from the backend.</p> <p>Now, the AJAX listener performs a security check on all incoming requests, making sure that only valid client IPs get responses. The valid IP are stored in the backend too.</p> <p>To get the client's IP I used plain old</p> <pre><code>$_SERVER['REMOTE_ADDR'] </code></pre> <p>which works out for most of the clients. Today I ran into an installation where remote_addr contained the IP of an network adapter which was'nt that one which performed the actual communication for my application.</p> <p>Googling around agve me <a href="http://roshanbh.com.np/2007/12/getting-real-ip-address-in-php.html" rel="noreferrer">Roshan's Blog entry on the topuic</a>:</p> <pre><code>function getRealIpAddr() { if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))//check ip is pass from prxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } return $ip; } </code></pre> <p>Sadly the problem persists.</p> <p>Did anybody ever stumble into this sort of problem (actually I don't think that I discovered a completly new issue ^^) and has an idea for me how to fix this?</p> <p><strong>EDIT:</strong></p> <p>I'm on </p> <ul> <li>PHP Version 5.2.9-1</li> <li>Apache/2.2.9 (Win32) </li> </ul> <p>The communication is done via a regular LAN card. Now the actuall client has several devices more. VMNet adapters and such.</p> <p>I'm wondering how a client configuration can 'disturb' a web server that much...</p> <p>TIA</p> <p>K </p>
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    1. COcan you put in some details here regarding the adopters and the server running the application.. i mean what IPs do they hold.
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    2. COpls see my addition
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    3. COso example scenario might look like this on client end: eth0 - 10.0.0.1 eth1 - 10.1.1.1 then on server u have 10.1.1.2 and when the request goes through from client instead of 10.1.1.1 it shows 10.0.0.1 ?
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