Take the 2-minute tour ×
Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

I have a new iPad (iPad 3) with personal hotspot turned on. I also have a Macbook Air connected to my local wireless network (the Air is not connected to the iPad personal hotspot). However, when I plug the iPad into my Macbook via USB, the iPad personal hotspot turns on and I see the blue bar at the top with one connection. Can you explain why this is happening?

Did the Macbook stop using my local network wifi internet connection and start using the iPad's personal hotspot connection? Is this using up my cellular data allowance while I use the Macbook when the iPad is connected to the USB port?

share|improve this question
    
Why is the hotspot on? Are you using it with another device while all this is happening? –  CajunLuke Jun 29 '12 at 22:22
add comment

2 Answers 2

up vote 2 down vote accepted

If you plug any cellular enabled iOS device with Personal Hotspot turned on to a Mac via USB, the Mac will automatically open a network connection using the Personal Hotspot.

So yes, your Macbook Air will be the 1 connection you see.

The second part of your question is a little trickier and the answer is both complex and confusing but I will try to explain as best I can.

Here's a screen shot of my network config.

Based on older knowledge with other multiple interface *nix systems is that it will be a complete toss up as to which connection your Mac will use since both active connections could possible provide the same route to the destination for any network query.

I have even seen, on both Windows and Unix networks, traffic coming in on one network connection and going out on another, which rarely works well.

To get round this, in the Network panel you could disable the "iPad USB" in your default location, but then set up a new location where your "iPad USB" is not disabled.

Finally, the order of your devices should mean that if your wifi is above the iPad USB device in your list when both are enabled, it will get priority over the hotspot, but there are still caveats and this could still use cellular data, but of a lesser amount.

share|improve this answer
add comment

Just disable the hotspot from the iOS device when it's connected to the macbook. That's what I always do unless I'm on the road and really need the mobile internet.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.