interface/web/admin/form/server_config.tform.php
@@ -91,6 +91,10 @@ 'formtype' => 'TEXT', 'validators' => array(0 => array('type' => 'ISV6PREFIX', 'errmsg' => 'v6_prefix_wrong'), 1 => array('type' => 'V6PREFIXEND', 'errmsg' => 'v6_prefix_end'), 2 => array('type' => 'V6PREFIXLENGTH', 'errmsg' => 'v6_prefix_length') ), 'default' => '' ),