PCF?

John Breeden jbreeden at plumhall.com
Thu May 13 16:06:23 EDT 2004


Market acceptance is everything. The early Cisco/Aironet 802.11 stuff 
supported PCF. No one used it.

You also take a bigger overhead hit with PCF vs DCF.

Much to everyone's suprise DCF worked "good enuff" with hidden nodes.

Isn't it strange how CA sounds "better" than CD? :-)

Simon Barber wrote:

>802.11 works in an unlicensed radio band, so working to prevent
>individual DoS attacks has little point.
>
>Simon
>
>
>-----Original Message-----
>From: hostap-bounces+simon=instant802.com at shmoo.com
>[mailto:hostap-bounces+simon=instant802.com at shmoo.com] On Behalf Of
>Jason Straight
>Sent: Thursday, May 13, 2004 8:09 AM
>To: hostap at shmoo.com
>Subject: Re: PCF?
>
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>Well, hrm, that sucks. With the vulnerability (not really news) posted
>on 
>slashdot, I'm afraid that script kiddies will soon have simple tools to
>DoS 
>802.11, and PCF could be a simple workaround for that.
>
>http://www.auscert.org.au/
>
>
>On Thursday May 13 2004 11:03, Andrea G. Forte wrote:
>  
>
>>Well, I do not know about the document that you mention, but when I 
>>asked about PCF I got the same answer that I gave you by Jouni, so I 
>>am "quite" sure hostap does not support it. ;)
>>
>>Andrea
>>
>>On Thu, 13 May 2004, Jason Straight wrote:
>>    
>>
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>>>Are you certain?
>>>
>>>According to this:
>>>http://home.eunet.cz/jt/wifi/HFA3842.pdf
>>>
>>>it is supported by intersils's MAC controller.
>>>
>>>On Thursday May 13 2004 10:39, Andrea G. Forte wrote:
>>>      
>>>
>>>>The prism2 card firmware does not support PCF, therefore the 
>>>>hostap driver doesn't either.
>>>>
>>>>Andrea
>>>>
>>>>On Thu, 13 May 2004, Jason Straight wrote:
>>>>        
>>>>
>>>>>-----BEGIN PGP SIGNED MESSAGE-----
>>>>>Hash: SHA1
>>>>>
>>>>>Has any work been done on implementing PCF using hostap? I know 
>>>>>the firware of a device should take over when it's a client to a
>>>>>          
>>>>>
>
>  
>
>>>>>PCF enabled AP, but is there any way to turn on PCF when using 
>>>>>hostap in Master mode?
>>>>>
>>>>>For those who don't know - PCF is a polling method for 802.11. I
>>>>>          
>>>>>
>
>  
>
>>>>>looked into this a few years ago and found nothing, but hoping 
>>>>>perhaps something has changed or someone else might be working 
>>>>>on something to make it a possibility?
>>>>>
>>>>>http://www.wi-fiplanet.com/tutorials/article.php/1548381
>>>>>
>>>>>- --
>>>>>The ACLU is good because it uncompromisingly defends certain 
>>>>>parts of the Constitution, the NRA is bad, because it defends 
>>>>>other parts of the Constitution.
>>>>>
>>>>>http://www.skycon.net/
>>>>>ICQ: 1796276
>>>>>pgp: http://www.jeetkunedomaster.net/~junfan/pgp.key
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>>>>>          
>>>>>
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>>>>
>>>- --
>>>The ACLU is good because it uncompromisingly defends certain parts 
>>>of the Constitution, the NRA is bad, because it defends other parts 
>>>of the Constitution.
>>>
>>>http://www.skycon.net/
>>>ICQ: 1796276
>>>pgp: http://www.jeetkunedomaster.net/~junfan/pgp.key
>>>-----BEGIN PGP SIGNATURE-----
>>>Version: GnuPG v1.2.4 (GNU/Linux)
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>>>      
>>>
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>>    
>>
>
>- -- 
>The ACLU is good because it uncompromisingly defends certain parts of
>the 
>Constitution, the NRA is bad, because it defends other parts of the 
>Constitution.
>
>http://www.skycon.net/
>ICQ: 1796276
>pgp: http://www.jeetkunedomaster.net/~junfan/pgp.key
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