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This article was written based on firmware version 5.0.0.
Typically all computers connected to a router are protected by the router’s firewall. In order to allow a computer on the Internet to connect through the router to a specific computer it is necessary to either manually forward the required ports, Port Forwarding on a Series 3 CradlePoint, or place the device/computer on the CradlePoint’s Demilitarized Zone (DMZ).
The CradlePoint’s routers DMZ opens all ports that are not already reserved and passes them to a single device/computer attached to the routers LAN. This essentially places the device/computer outside the CradlePoint’s firewall. This setting is often used to allow gaming consoles to host online games.
Any port forwarding rules or enabled administrative ports have a higher priority than the DMZ rule.
Before adding a computer to the DMZ it is important to ensure that the device/computer is always assigned the same IP address from the Cradlepoint router. To ensure that the device/computer is always assigned the same IP address from the Cradlepoint router Add a DHCP reservation on a Series 3 CradlePoint. Verify that the device/computer receives the correct IP address from the router.
- Log into the router’s setup page (login instructions).
- If your router has a Basic Mode / Advanced Mode toggle button beneath the CradlePoint logo on the top left-hand side (e.g. MBR95, CTR35), you will need to set it to Advanced Mode.
- Then, click on the Network Settings tab then select Firewall.
- Expand the ADVANCED DMZ (DeMilitarized Zone) section.
- Check the Enabled box then enter the device/computer IP address into the IP Address field.
- Click Apply to save settings.
The device/computer is now outside of the routers firewall. Any connection originating from the Internet that does not have an applicable port forwarding rule will be passed directly to the device/computer in the DMZ.