Best architecture for R12.1.3 , where irecruitement is published external.

Hi Experts,
Please suggest us a healthy configurations, considering the following headlines.
1. Our irecruitment portal should be published to external web world, where we have no control on the no of users connecting.
2. And our database should be a RAC.
Regards
Uday

Please suggest us a healthy configurations, considering the following headlines.
1. Our irecruitment portal should be published to external web world, where we have no control on the no of users connecting.Additional Configuration and Deployment Options in Release 1
https://blogs.oracle.com/stevenChan/entry/additional_configuration_and_d
Troubleshooting DMZ Setups for Apps
https://blogs.oracle.com/stevenChan/entry/troubleshooting_dmz_setups_for
What Does "DMZ Certification" Mean?
https://blogs.oracle.com/stevenChan/entry/what_does_dmz_certification_me
In-Depth: Demilitarized Zones and the E-Business Suite
https://blogs.oracle.com/stevenChan/entry/indepth_demilitarized_zones_an
Securing DMZ Application
https://blogs.oracle.com/muralins/entry/securing_dmz_application
Applications Running Through a Firewall
https://blogs.oracle.com/millmore/entry/applications_running_through_a
2. And our database should be a RAC.Database Documentation Resources for EBS Release 11i and R12 [ID 1072409.1] -- RAC
Thanks,
Hussein

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