Do add on domains need a unique ip address or can they point to the same ip address as the main domain and use the .htaccess file to redirect to the subfolder?
Details:
I am trying to host two web applications on a single server. I setup the new domain name as an add on domain to my current server. In the process of getting it to work I replaced the new domain A record ip address with the current domain name ip address on the server thinking that it had to point to the same place.
Now when I type out the full www.domainname.com it just points to the same files as the other web application and if I type only domainname.com it gives me a warning and fatal error about failing to open a required file css_version.php.
I managed to get domainname.com to redirect to the proper add on subfolder using the .htaccess file but www.domainname.com still points to the other web application.
Can I fix this with the .htaccess file or does the domain name need to have a unique ip address for the server to differentiate between the two domains and if so how can I get the unique ip address it had back?