Is it possible to put my AirPort in access point mode, so it creates an infrastructure (ie, non-ad-hoc) network from the command line on OS X?
Similar to using System Preferences -> Sharing -> Internet -> Share from … to computers using WiFi.
MacOS – Create AirPort network from the command line
airportmacoswifi
Related Solutions
You can only share Internet from an Ethernet, Bluetooh, or FireWire connection over Wi-Fi.
That's because you can only use your Wi-Fi connection for one thing at a time. If you're connecting to the Internet over Wi-Fi you won't be able to share that connection over Wi-Fi.
If you've got Share your connection from: set to Wi-Fi, it's normal that To computers using: doesn't have a Wi-Fi option:
Run the following to list all connections on your Mac through all interfaces.
arp -a
To limit to a single interface, use:
arp -a -i en1
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Best Answer
After some hours of digging through the internet, it seems that the only way to put an airport in HostAP ("software base station") mode in OS X 10.8 Mountain Lion is to programatically call a the internal, undocumented,
startHostAPModeWithSSIDmethod.I've updated the one example I could find online, and it does seem to work, with the one caveat that only WEP, not WPA, can be used: https://gist.github.com/4418079