This topic provides a reference for setup of port forwarding, to connect from outside, with the Airport Extreme Router.
Step 1: Connect to your Airport Extreme Router with the Airport Utility.
Step 2: Click on "Manual Setup" at the bottom left corner of the utility.
Step 3: Write down the external IP address of your router. It should NOT start with "192" or "10".
NOTE: You may need to configure port forwarding through your Cable or DSL modem and any additional routers if the Airport Extreme does not have an external IP address that does not start with "192" or "10".
These next three steps (Step 4-6) are recommended so that your computer system always has the same internal IP address. This way you will not need to update your port forwarding settings again.
Step 4: Click on the "Internet" tab, and then the "DHCP" sub-tab. Then click on the "+" symbol to add an entry for the Mac/PC you want to connect to from outside your home network.
Step 5: Create a description/name for this entry.
Step 6: Find out your MAC address. This link can help explain how to get the MAC address: "http://www-dcn.fnal.gov/DCG-Docs/mac" Also, enter a permanent internal IP address for your Mac/PC. Recommend using an address outside the DHCP range shown in Step 4.
Step 7: Click on the "Internet" tab and "NAT" sub-tab, and then click on "Configure Port Mappings..."
Step 8: Next, click on the "+" symbol to add the port mappings.
Step 9: Enter the three ports your Splashtop Remote Streamer and client are set to use in the Public and Private TCP port fields. By default these are "6783 6784 6785". Also, type in the internal IP address of the Mac/PC that you want to connect with (Step 6).
NOTE: Do not select a service from the drop down list. It will only pre-populate the entries for you.
Step 10: Type in a description for the port mapping settings.
NOTE: For additional computers you want to connect with, repeat Steps 8-10, but they need to use different consecutive port numbers, such as "6883 6884 6885". Remember to set the streamer and client to these ports as well.
Step 11: Finally, remember to click on "Update" to save all the changes. This will save your settings and restart the router, so your connections will be lost temporarily.
Step 12: Moving to the tablet / phone app — Create an entry in your client by clicking on the "+" near the upper left corner of the Splashtop Remote client (iPad).
Step 13: Make sure to use the external IP address from Step 3. This is where you can enter in your DynDNS address instead of the external IP address, if you have it set up.
NOTE: Your external IP address may change, and you will need to update this entry if it does.