Wireless sensing function is missing?
Sam Leffler
sam at errno.com
Sat Mar 18 16:03:01 UTC 2006
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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