[TYPO3] IP address in URL

[Gunda]

Hi everybody,
We have a peculiar problem and have been unable to find any help in many hours or 
searching through forums and documentation.  We are unable to get Typo3 change our host 
server's IP address (i.e. 192.168.1.1) to the web domain name (mydomain.com). We can 
type www.mydomain.com into the browser address, the site is loaded but it shows the IP 
address instead of the domain name in the URL. Our ISP says we need to change a Typo3 
setting. 
Which file needs to be edited or what settings need to be altered? 

In an earlier response, Ries (many thanks) asked us to have a look at the baseURL. Can we 
find this in the Install Tool? If so, in which folder/directory do we need to look? In the php.info, 
our site URL is set to the IP address. Does this need to changed to the domain name and if 
so how can we do this? 

Thanks for any help in advance!
Gunda