Hi people.
If you have draytek Vigor and you can't make certain adjustments, such as the Lan Rate Control, then it's probably because you're using the lastest versions on IE 8 and they just don't allow the changes.
It'll look like they're done, but bottom left of the screen you'll have a little yellow warning triangle and "errors on page" showing and when you leave that menu and return, the changes didn't work.
In IE8 go to Tools, and click Compatibility View.
This should also remember that your router IP address requires Compatibility view, so you shan't need to do it again.