You may have end-users outside of your organization's firewall who need access to E-Business Suite. One way of doing that is to set up a reverse proxy server and a series of network segments separated by firewalls.
The outermost network segment that lies between the internet and an organization's intranet is often called a Demilitarized Zone (DMZ). DMZs are enforced by firewalls and other networking security devices.
Setting up a DMZ
Instructions for deploying EBS 12.2 in a DMZ-based architecture are published here:
Externally-facing EBS products
A subset of EBS products can be deployed for external use, including iSupplier, iRecruitment, iSupport, and others. Many of these products have special rules that must be enabled in the URL Firewall to work properly in external deployments. For a complete list of E-Business Suite products certified for external use, see Section 6 in Note 1375670.1.