Running HTML DB apps on one machine with the database on another

I first want to apologize for this question being asked AGAIN.
I have spent the better part of the day reading through a lot posts regarding this issue (and there are a lot). My boss sent me this requirement on a new project that Oracle Forms and Reports run on one server and connect back to the database on another server for security. HTML DB needs to do the same thing.
The question:
I have found out that the DAD file needs to be modified to allow this type of set up to work and the HTTP server needs to be running on that server. He is asking what in the DAD file needs to be changed to allow this to work. Would someone provide me with an example of what would need to be changed?
Also, I'm confused on the implementation of this. Currently all the applications I've created are for "in-house" users. This project is the first (that I've done) that is going to be open to users outside the company. I'm confused on the link that will be supplied to the users. After I import my application into the production database, I run it to get the link and send that to our users. If the application is going to be run from a different server from the database, how is/will the link to run the application be built? I hope I'm describing this well.
Thanks,
Joe

Joe,
You wouldn't have the database server "open to the outside world". All you'd need to have open would be the port for HTTP traffic.
There are two scenarios -
1) Having them both (DB & Apache) on the same machine
You would still only have the HTTP port open. The "fear" is that if the Apache server is compromised then they have access to the database machine.
2) Having them on separate machines.
In this case if the Apache server is compromised then, since by definition, you have a route from the Apache server to the DB server then they can still reach the DB machine from the Apache server machine.
The thing to do here is to ensure your Apache server is patched and secure, regardless of whether it's running on the same machine as the DB or not.
I'd be interested to see what others think.

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