This is my first day with piwik. I was trying to setup the website statistics using server side PiwikTracker PHP API. It finally worked out fine, but in my config I encountered a little bug. Because of having always a curl request made from website server to piwik server, I had always the same IP and provider for each visit set in statistics.

Maybe I have something configured badly, but I can't see the 'cip' parameter propagation from the source request in Piwik_Tracker class. I solved the problem manually. In [source:/trunk/core/Common.php] in getIpString() method there's following code:

        $default = '0.0.0.0';
        if(isset($_SERVER['REMOTE_ADDR']))
        {
            $default = $_SERVER['REMOTE_ADDR'];
        }

Working code, properly receiving 'cip' parameter from PiwikTracker request is following:

        $default = '0.0.0.0';
        if (isset($_REQUEST['cip']))
            $default = $_REQUEST['cip'];
        else if (isset($_SERVER['REMOTE_ADDR']))
            $default = $_SERVER['REMOTE_ADDR'];

Now I have users' IP properly tracked.

This may be just workaround and probably there's a better solution.