Hiiragi, the idea is to allow old links to your IPB to point to their new equivalents on XenForo. Therefore, your XF does not need to know anything about your IPB, it just responds to requests for content as usual.
However, your IPB directory needs to contain the .htaccess file, ips2xf.php and 301config.php files from the archive, which will intercept links pointing to the IPB content and redirect them to the XF installation instead. All you need to do is fill in the required values in the 301config.php file.
However, your IPB directory needs to contain the .htaccess file, ips2xf.php and 301config.php files from the archive, which will intercept links pointing to the IPB content and redirect them to the XF installation instead. All you need to do is fill in the required values in the 301config.php file.