Subject: Re: Testing AP mode with WLAN-USB-Stick: How to obtain?
From: Johannes Berg <johannes@sipsolutions.net>
To: Hin-Tak Leung <hintak.leung@gmail.com>
Cc: =?ISO-8859-1?Q?G=E1bor?= Stefanik <netrolller.3d@gmail.com>,
	Stefan Steuerwald <salsasepp@googlemail.com>,
	linux-wireless@vger.kernel.org
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Date: Wed, 10 Jun 2009 09:30:27 +0200
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On Wed, 2009-06-10 at 04:18 +0100, Hin-Tak Leung wrote:

> But I have been using vendor driver 3.0 for a few weeks in AP mode and
> I am as happy with it as I could be, I think; I have
> suspended//resumed clients.  It works adequately.=20

We're not concerned about suspend/hibernate, we're concerned about
802.11 power saving, where the AP is required to buffer frames until the
clients wake up again. This will work adequately, but not perfectly, for
unicast frames, but we have not found a way of making zd1211 send
buffered multicast frames after the DTIM beacon as required.

This means that your sleeping clients will not be receiving multicast,
and as such be invisible to the network once they fall off the ARP/NDP
caches. This is the reason we have said that it will not be possible to
support AP mode with this card. I'm curious how, if at all, the vendor
driver handles that.

johannes

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