I just set up multiple installations of multisite on one server (which has 1 static IP) and each installation is located in its own folder off of the Root folder. There is also a website installed to the Root folder.
These installations are not subdomains of one install. They are each separate installs placed within their respective "Root Folder" off of the actual Root Folder. (hopefully that makes sense)
Server Folders Example (1 static IP serves all domains):
(/) "site1" - domain mapping installed
(/site2/public_html) "site2" - domain mapping installed
(/site3/public_html) "site3" - domain mapping installed
(/site4/public_html) "site4" - domain mapping installed
Example of my issue:
A) Site2 has a mapped domain. When I attempt to visit the mapped domain for some reason it resolves to the right server IP but sends me to the ProSites upgrade page of Site3.
B) I can reach a subdomain url just fine (blog1.Site2.com) but I can't reach the primary domain (Site2.com) - It's weird...
Each domain has sunrise.php where it needs to go, each has define('SUNRISE', 'on'); within wp-config and all subdomain installs are "true"
Hope there is enough here to get some help started. I'm using SiteGorund for the host. Thanks!