Access panel with a valid domain (using valid IP on the Internet)

[kfot]

Panel installation was performed without problems, the services necessary to run perfectly after installation.

I installed the panel in a clean debian system.
I installed the panel without problems using the php command. The panel should work out I need to set the DNS, ok? DNS must be set to run the hosted pages, is that right?

Once installed, if I use the internal ip I can access the panel but can not access the hosted pages, and if I use the external IP can not access the panel ispcp.
I have a question, the panel configuration using the php command I set the IP internal or external?
Maybe this is the main problem.

grateful