[c-nsp] iphone, Cisco AP/WLC & web-auth

[Jared Mauch]

This sounds like an excuse for poor design on ciscos part. I have seen  
numerous "web" portal auth systems for hotels, conferences and other  
venues. When my laptop goes to sleep or needs to re auth I may get a  
brief web redirect but other activity such as ssh and IMAP do not get  
blocked. I would hope that folks start tuning their networks to not  
annoy those PDA and iPhone users just to save a small bit of state  
memory or disk space.

Jared mauch
jared at puck.nether.net

On Aug 3, 2007, at 9:52 AM, "Yuri Lukin" <lists at swaggi.com> wrote:

> On Thu, 02 Aug 2007 12:19:28 -0700, matthew zeier wrote
>> Yuri Lukin wrote:
>>
>>> When the iphone sleeps, does it go into Power Save Mode?
>>
>> I don't know and I don't know how to check (the screen goes dark).
>> If it did, and powered the radio off, would that matter?
>
> Yes, if the iphone goes into power save mode, the radio will power  
> off to
> conserve battery power and it will wake up periodically and poll the  
> AP with a
> PS Poll frame to see if there are any packets buffered for it. If  
> there's a
> delay in the "wake-up mechanism", the AP may ignore the PSP frames  
> and thus
> cause the iphone to re-auth. This is a common problem with many hand- 
> held
> devices using power save mode, that's why sometimes it can help if  
> you disable
> it on the client. You can confirm if this is indeed the case by  
> running a
> wireless sniffer like Airopeek or Omnipeek Personal.
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