Reports that Apple's iPhone may have been responsible for knocking out the Duke University wireless network were untrue, it has emerged.

Duke University first reported that it had been enduring a wireless problem involving a few iPhones on Friday 13 July. It was then alleged that iPhones on the network would intermittently knock out huge batches of wireless base stations.

Duke's IT staff identified the source of intermittent floods of Address Resolution Protocol (ARP) requests as at least two Apple iPhones connecting via the phone's built in wireless LAN adapter to Duke's campus-wide net.

But it was Cisco, not Apple, that was to blame.

In a statement posted to the universities website late on Friday, Tracy Futhey, Duke’s chief information officer, said that “Earlier reports that this was a problem with the iPhone in particular have proved to be inaccurate.” The statement went on to stress that the iPhone is fully operable on the university network.

"Cisco worked closely with Duke and Apple to identify the source of this problem, which was caused by a Cisco-based network issue," said Cisco in a statement provided to Macworld. "Cisco has provided a fix that has been applied to Duke's network and the problem has not occurred since."