You can install the BlackBerry® Router on a computer that is separate from the computer that hosts the BlackBerry® Enterprise Server. You can install the BlackBerry Router on a remote computer if you want to support multiple BlackBerry Enterprise Server instances, create a remote BlackBerry Router pool, or if your organization's security policy requires that internal systems cannot make connections directly to the Internet and all systems must connect through another system in the DMZ.
The BlackBerry Router does not use many system resources, but it is a critical connection point for the BlackBerry® Enterprise Solution. You can install multiple BlackBerry Router instances for high availability if the primary BlackBerry Router becomes unavailable.
If you install the BlackBerry Router in the DMZ, you can permit users to log in to your organization's LAN remotely and you can deploy BlackBerry devices through a computer that is running the BlackBerry® Device Manager.