Get client IP in Nginx-Varnish-Apache Stack

Add the following to wp-config.php…

if ( ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) && preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
        $_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_X_FORWARDED_FOR'];

Ref: http://naze.mine.nu/?p=363

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