On Tue, May 4, 2010 at 10:15 AM, John Clark <jcl...@metricsystems.com>wrote:
> Pat Erley schrieb: > >> On 03/30/10 12:31, John Clark wrote: >> >> >>> What is the reason for this limit? Is it because of a hardware issue, or >>> certain chip sets don't support more, or >>> just from an earlier time? >>> >>> John Clark. >>> >>> >> I believe (this is from a vague memory of a chat a while back) that it's >> due >> to beacon intervals... once you exceed 4 SSIDs in 1 device, it's nearly >> impossible to beacon reliably on all 4 with traffic. So it's mostly a QOS >> issue/sanity issue. If you're really interested in understanding it, I >> suggest the o'rielly wireless networks book[1]. After reading it twice, >> I have a much better understanding of how it all works. Worth every >> penny. >> >> > > Just getting back to this question. I'll have to dig that book up. I bought > it some time ago, but haven't > been involved with 802.11 much in the last couple of years. > > However, if it is a 'beacon interval' issue... then one wonders how that is > handled by 'commercial' entities > that claim to be able to support 8 or 16 SSID's??? > > Since the box I'm using is Atheros based, and the manufacturer uses the > Atheros SDK, and makes a > claim for supporting 8... one wonders??? > > If it's a matter of lazy fair, let the user beware, and allow more than 4, > with the knowledge that through > put can be impacted, the for the sake of specsmanship, I'd allow the > capability... I realize some people > don't like that sort of marketeering approach... that that's the way the > world seems to go. > > Perhaps they wind out the beacon interval. the default is 100ms, If you have 4 ssids you are sending a beacon every 25ms If you made the beacon interval longer you could have more ssids ---------------------------------------------------------- Chris Martin m: 0419812371 ----------------------------------------------------------
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