CCIE Pursuit Blog

July 20, 2007

Off Topic: iPhone vs Cisco Resolved???

Filed under: Cisco,Wireless,Work — cciepursuit @ 4:17 pm

***Update: It WAS a Cisco issue – not an Apple iPhone issue***

Here’s a follow up to the story of the new Apple iPhone killing Duke University’s Cisco WLAN.  Well…..not much of a follow up as it turns out.  The entire text of the article is below, no mention of what caused the issue (pretty anti-climatic to say the least):

This story appeared on Network World at

Duke’s iPhone mystery reportedly resolved
By John Cox, Network World, 07/20/07

The Duke University wireless problem involving a few Apple iPhones has been resolved, according to Apple. But so far, neither Apple nor Duke has released any details about the cause of, or solution to, a problem that ignited a tidal wave of interest among IT professionals and bloggers on the Internet.

A Duke spokesperson, via e-mail, says “We are still trying to get details about this ourselves.” Whether the “we” referred to Duke’s IT staff or the PR staff was not clear. E-mails to Duke’s CIO and deputy CIO had not yet received a reply. Confirmation of the resolution came via a short e-mail from an Apple spokesperson.

The wireless problem crystallized exactly a week ago, on Friday, July 13, as it happens, when 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. The ARP floods, up to 30,000 requests per second, knocked offline sometimes as many as 30 access points, for 10 to 15 minutes.

As of last Tuesday, the last day Duke provided any details of the ongoing problem, nine such events had been recorded. The IT staff have been working with both Cisco, the school’s WLAN vendor, and Apple to puzzle out the problem.

They had plenty of help, from amateurs, experts and would-be experts who debated the possible causes, and assigned blame, in online forums at and dozens of other Web sites.

All contents copyright 1995-2007 Network World, Inc.


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