iPhone taking down network

August 10, 2012 at 14:51:56
Specs: Windows 7
Mobile devices are saturating our medium sized enterprise network. Examples of these devices are iPhones, iPads, Kindles, Droids, etc… When a device is authenticated on our APMobile wireless network and downloads updates, email, or music our Network bandwidth is consumed. Services/Applications are no longer available, such as VoIP. Basically, this is an internal DoS.

I have done some research and an example of this problem is an “ARP Storm” but currently clients obtain IP addresses form our DHCP server, which acts as a proxy for the clients and if effective against deliberate attempts to craft packets that create “ARP Storms”. In addition we configured the WLC to disable ARPunicast processing via the CLI.

The following link is from Cisco's site. It is the ARPstorm that we originally thought was the cause but after more researching we found it wasn't this exact issue - http://tools.cisco.com/security/cen...

Does anyone have any ideas as to why iPhones frequently take down our network? Could this be a configuration issue with our firewall (Cisco ASA 5520 running version 8.4(2))?

Please advise.

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August 11, 2012 at 10:26:01

That ^^ seems to describe the problem although there is no real solution provided. Basically, it points to Broadcom chipsets inside the phones.

Some type of bandwidth control maybe the answer.

How do you know when a politician is lying? His mouth is moving.

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