Date: Sat, 18 Mar 2006 08:06:39 -0800 From: Sam Leffler <sam@errno.com> To: Kan Cai <kcai@cs.ubc.ca> Cc: freebsd-net@freebsd.org Subject: Re: Wireless sensing function is missing? Message-ID: <441C300F.3020900@errno.com> In-Reply-To: <Pine.GSO.4.60.0603172105340.784@granville.cs.ubc.ca> References: <Pine.LNX.4.60.0603171355470.9710@lore.cs.ubc.ca> <20060318043019.GR37590@spc.org> <Pine.GSO.4.60.0603172105340.784@granville.cs.ubc.ca>
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Kan Cai wrote: > > > On Sat, 18 Mar 2006, Bruce M Simpson wrote: > >> On Fri, Mar 17, 2006 at 02:00:28PM -0800, Kan Cai wrote: >>> I wonder if this is true that sensing function is missing? If yes, >>> is it >>> supposed to be implemented in the driver or net80211 layer? Thanks in >>> advance! >> >> It's a function of the 802.11 hardware. I assume you're describing the >> CSMA/CA technique. The Coordination Function (CF) in use will also have >> an effect but you don't specify if you're in IBSS or EBSS mode. > > Yes, I meant CSMA. But I was actually using ralink card, which has > 802.11 firmware implemented in open source. I am aware that freebsd has > a 80211 layer as well. So before I dig into the source, I would > appreciate it if anyone can let me know where CSMA is implemented, in > the driver or net80211 provided by freebsd. > > I tried both ad hoc mode and hostap mode, btw. DCF is implemented in hardware. Carrier sense is part of that. Sam
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