I have a MacBook Pro and a iMac. On the MacBook I see a network interface named "iPhone USB" in my Network Settings. On the MacBook the internet sharing over usb works fine. But on the iMac it doesn't work. On the iMac there is no "iPhone USB" interface and it doesn't appear a "New network device detected" window if I connect the iPhone to the iMac via USB. How can I add the "iPhone USB" network interface?
MacBook Pro 10.7.2