Hello 1bavarian. Welcome to the Apple Discussions!
I think there is supposed to be a way to use the Airport Utility so that I can add DMZ address and/or port forwarding.
You can configure the 802.11n AirPort Extreme Base Station (AEBSn) for either a "Default Host" (the same as a DMZ) or for Port Mapping (same as Port Forwarding). The former opens all ports on the AEBSn to a single device; the latter only opens selected ports.
The Foscam support site offers the following instructions. I have added comments, specific to the AEBSn, as appropriate, after each step:
Step 1) Write down the local IP address of your camera. To find this address open IP Camera Tools (apple mac users, use IP Scanner Tool) and it will display the IP address of the camera as “h**p://[YourCamerasLocalIPAddress])
Step 2) Write down your router’s external internet IP address. The easiest way to find this would be to Google “What is my IP address” and go to the first link which pops up and that is usually whatismyipaddress.com.
(This is the Public IP address assigned to your AEBSn by your ISP. You can find this using the AirPort Utility. ref: AirPort Utility > Manual Setup > AirPort > Summary > IP Address)
Step 3) Log in to your wireless router. To do this you must enter the IP address of your router into your browser and then enter the username and password when prompted. If you are unsure of the ip address or username and password of your router, refer to your router’s manual or view a list of default router IP addresses, usernames and passwords by Google searching “default router IP addresses” and clicking on the PDF titled “List of default Router Admin Passwords and Default Router IP” at:
http://www.answersthatwork.com/DownloadArea/ATW_Library/Networking/Network__4-List_of_default_Router_Admin_Passwords_an d_IPaddresses.pdf
(For the AEBSn, you must use the AirPort Utility to perform any router administration as the AirPorts do not provide a browser-based interface.)
Step 4: Go through the options on your router until you find an option that says “DMZ”, “Virtual Server”, or “Port Forwarding” (if you have your routers manual, it should explain this as well). I) If you clicked on the DMZ option then you need to set the DMZ IP address (also called “private”/”local” IP address”) to the your cameras local IP address, enable the option, save the configuration and restart the router. II) If you clicked on “Virtual Server” or “Port Forwarding” then you need to set the the Local/Private IP address to your camera’s local IP address, set the inbound port to 80 and the outbound port to 80 (you can change the port numbers later). Save the configuration and restart the router.
(Configuring for a DMZ or Port Forwarding requires a different set of steps. Please let me know which you would prefer and I can provide them to you.)
Step 5) To test it to see if you set it up correctly, open a browser and enter your external internet ip address into the address bar and press enter. You should arrive at your camera’s login screen.
Also, is the SSID the same as the Airport Extreme name (which also has a hyphenated version followed by .local)?
No, that would be the AirPort's Base Station Name. The SSID is actually the same as what Apple calls the "Wireless Network Name." (ref: AirPort Utility > Manual Setup > AirPort > Summary > Wireless Network Name)
