iphonemacostethering
In Yosemite, when I connect my iPhone to my Macbook Air through USB the iPhone becomes a internet hotspot for my Mac, even though I've connected the MBA via ethernet. If I enable Wifi, then Wifi is prioritized.
Can I change so that ethernet is prioritized over the iPhone?
I actually think there's little reason to be concerned, provided in Settings > Network, your Wi-Fi or Ethernet is ahead of iPhone USB in the left-hand list. OS X will go down the list and pick the first network provider that it needs to. So long as your WiFi stays up, you're fine.
I confirmed this by opening Network Utility and examining the transfer stats. You can see in the attached screenshots that all the action (packets) are happening over WiFi, hardly anything over iPhone USB.
Somewhere around late 2014 is got very reliable for me. I don't know if iOS changed, OS X changed or both, but before then I continued to have the problems you describe with Mountain Lion 10.8.4 and earlier.
Of late, this has been quite solid and at worst, toggling the connection in network preferences on OS X fixes any connection issues with iOS hotspot being solid in general.
Before the fixes, the problem seems to be a timing issue.
What I've found is that if the connection light doesn't show green, I want to disconnect the device and turn off tethering on iOS. After waiting 5 seconds or so, I turn on tethering again on iOS and be sure to leave the tethering screen showing. (don't leave the settings app) I then reconnect the device and listen for it to signal that it's connected with the chirp iOS makes when connecting to a computer. If the light doesn't go green in system preferences, I toggle the Personal Hotspot off, count a few seconds and turn it on.
Occasionally, something just isn't correct on the Mac end and I switch to Wi-Fi tethering and delete the interface in System Preferences and then start over with the set up.
I wish I could say this worked reliably for me, but it seems to be fidgety and prone to errors and lock up.
Best Answer