Fixed address bar url zend framework app

Question

So first of, hi, I have probably a simple issue but I'm not expert enough to figure out what the problem is. I just deployed a zend framework application on a debian server. I have dotster as registrar and another provider for the dedicated server. The problem is about the domain mapping and the urls when navigating from page to page within the app. Basically when I use the server ip, like 91.121.121.171/public/ to reach the app, the url works just fine and displays well in the address bar like 91.121.121.171/public/directory/dir-comp for example. But when I use the url www.ceramstar.org this stays fixed. Did I mess up with dotster config or Apache rewrite rule? I must say I don't really get how to configure things properly on the dotster side... Thanks a lot anyway