DNS Settings for Internet and Intranet
 

Good day!
I used IIS 6.0, IE, phpmyadmin,mysql and it is in a 2nd server and my DNS was on the 1st server. My problem is, I don't know if i need to add a new domain for my intranet, I want to happen is my intranet website could be work in internet. I have no idea how can I do that.
Thank you