nanog mailing list archives
Re: iPhone and Network Disruptions ...
From: Warren Kumari <warren () kumari net>
Date: Tue, 24 Jul 2007 14:43:47 -0400
Adding to the random speculation pile this just arrived in my mailbox:------------------------------------------------------------------------ --
Cisco Security Advisory: Wireless ARP Storm Vulnerabilities Advisory ID: cisco-sa-20070724-arp http://www.cisco.com/warp/public/707/cisco-sa-20070724-arp.shtml------------------------------------------------------------------------ ----
It sounds like a badly configured pair of wireless controllers can, under fairly normal conditions, lead to an ARP storm...
I have no idea if this is the actual issue that occurred at Duke, but it *is* interesting....
W On Jul 24, 2007, at 12:28 PM, Frank Bulk wrote:
Duke runs both Cisco's distributed and autonomous APs, I believe. Kevin's report on EDUCAUSE mentioned autonomous APs, but with details as hazy as they are right now, I don't dare say whether one system or another caused orreceived the problem. Frank -----Original Message-----From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On Behalf Of DaleW. Carder Sent: Sunday, July 22, 2007 2:51 PM To: Bill Woodcock Cc: Sean Donelan; North American Network Operators Group Subject: Re: iPhone and Network Disruptions ... On Jul 21, 2007, at 8:52 PM, Bill Woodcock wrote:Cisco, Duke has now come to see the elimination of the problem, see: "*Duke Resolves iPhone, Wi-Fi Outage Problems"* at http://www.eweek.com/article2/0,1895,2161065,00.aspit's an ARP storm, or something similar,when the iPhone roams onto a new 802.11 hotspot. Apple hasn't issued a fix yet, so Cisco had to do an emergency patch for some of their larger customers.As I understand, Duke is using cisco wireless controllers to run theirwireless network. Apparently there is some sort of interop issue whereone system was aggravating the other to cause arp floods in rfc1918 space. We've seen 116 distinct iphones so far on our campus and have had sniffers watching arps all week to look for any similar nonsense. However, weare running the AP's in autonomous (regular ios) mode without any magiccentral controller box. Dale -- Dale W. Carder - Network Engineer University of Wisconsin at Madison / WiscNet http://net.doit.wisc.edu/~dwcarder
--Never criticize a man till you've walked a mile in his shoes. Then if he didn't like what you've said, he's a mile away and barefoot.
Current thread:
- iPhone and Network Disruptions ... Prof. Robert Mathews (OSIA) (Jul 21)
- Re: iPhone and Network Disruptions ... Sean Donelan (Jul 21)
- Re: iPhone and Network Disruptions ... Bill Woodcock (Jul 21)
- Re: iPhone and Network Disruptions ... Jim Popovitch (Jul 21)
- Re: iPhone and Network Disruptions ... Christian Kuhtz (Jul 21)
- Re: iPhone and Network Disruptions ... Dale W. Carder (Jul 22)
- RE: iPhone and Network Disruptions ... Frank Bulk (Jul 24)
- RE: iPhone and Network Disruptions ... Hank Nussbacher (Jul 24)
- Re: iPhone and Network Disruptions ... Warren Kumari (Jul 24)
- Re: iPhone and Network Disruptions ... Bill Woodcock (Jul 21)
- Re: iPhone and Network Disruptions ... Sean Donelan (Jul 21)
- Re: iPhone and Network Disruptions ... Prof. Robert Mathews (OSIA) (Jul 22)
- <Possible follow-ups>
- Re: iPhone and Network Disruptions ... Prof. Robert Mathews (OSIA) (Jul 24)
- Re: iPhone and Network Disruptions ... Iljitsch van Beijnum (Jul 24)
- Re: iPhone and Network Disruptions ... Marshall Eubanks (Jul 24)
- RE: iPhone and Network Disruptions ... Frank Bulk (Jul 24)
- RE: iPhone and Network Disruptions ... Dominic J. Eidson (Jul 25)
- Re: iPhone and Network Disruptions ... Warren Kumari (Jul 25)
- Re: iPhone and Network Disruptions ... Adrian Chadd (Jul 26)
- Re: iPhone and Network Disruptions ... Iljitsch van Beijnum (Jul 24)