What's the reason of running your application on a public IP Address? If you want to make the application available for external access then your option would be using DMZ -- Oracle E-Business Suite R12 Configuration in a DMZ (Doc ID 380490.1)
Thank you Srini, I will try it.
Thank you for your update. My manager want to access oracle ebs from anywhere, even if he/she can access ebs from another country.
I will try your suggestion.
I have question, how about security in oracle ebs, the example, I want change password default applsys (and others users) ?
Would you please give me advice.