
Setup of AirPort
Step 1: What's the problem with AirPort?
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Although computers connected via AirPort (WiFi, 802.11) only cannot be woken up, it's possible to wake up wired computers from a wireless one (e.g. wake up a file server on Ethernet from a PowerBook on AirPort). Problem is, Apple's AirPort Base Station uses NAP by default, Network Address Translation, which means that all wireless computers are located in a different IP network. In such a case, WakeOnLan cannot discover and wake up computers on the Ethernet network.
The solution to this problem is using the same IP network address for both the Ethernet and the AirPort networks. In the following example, we assume you would use the typical private IP network address 192.168.1.0 in your LAN. If you use a different address, change the values below accordingly.
Step 2: Setup an AirPort base Station
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Launch the "Airport Admin Utility", located in the "Applications/Utilities" folder. Login into your Base Station. Check the "Internet" tab. As you can see, the Base Station's Ethernet port has the IP address 192.168.1.10. (The router connecting to the Internet has the 192.168.1.1 in this case).
Now take a look at the "Network" tab. You can see we're using DHCP dynamic addresses for the wireless computers, from a range within our 192.168.1.0 network (from 11 to 19 in this example).
Now click "Update", wait for the Base Station to restart, and your AirPort network is ready for WakeOnLan.