[Xastir] UDP frames

[Alan Crosswell]

Thing of coordinating frequency and SSID in adhoc mode just like coordinating 
frequency and PL...  Sure there's gotta be coordination.
/a

J. Lance Cotton wrote:
> Alan Crosswell wrote:
> 
>> Bill Vodall wrote:
>>
>>> Hmmm.   Taking this a bit further.  Won't an 802.11x device have to be
>>> in ESS (peer-to-peer mode) instead of IBSS (controlled by an Access 
>>> Point)
>>> before it can pick up raw UDP packets?    This shouldn't be hard to 
>>> test..
>>
>>
>> Nope.  UDP is just UDP.  What the infrastructure (or lack thereof) 
>> does is irrelevant.  Think of it as working simplex (ESS) vs. working 
>> via a repeater/digipeater (IBSS) is all.
> 
> 
> Except that if your 802.11b card is blasting away UDP packets in ad-hoc 
> mode with the 'ssid' set to "abcd" and my 802.11b card is sitting next 
> to it in ad-hoc mode with the 'ssid' set to "wxyz", my card doesn't hear 
> anything from yours. So there has to be some amount of coordination. 
> It's obviously not the same as AP association, but it's similar. Kismet, 
> the 802.11 sniffer requires that your wireless card driver allows the 
> card to be put in 'rfmon' mode, which is like promiscuous mode for wired 
> ethernet. There has to be some kind of 'association' using the ssid or 
> you have the equivalent of an ethernet card with no cable plugged in.
> 
> Now, if we could get a wedge program that would turn on rfmon mode in 
> the wireless driver, then we could have a 1-to-1 equivalent with 
> AX.25/APRS...
> 
> -Lance
> 
>> You use UDP all the time when you watch streaming video or other 
>> applications like that which can tolerate some packet loss and keep 
>> working.  You drop some video packets, the picture just gets a little 
>> jumpy but it keeps working.
>>
>> /a
>>
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> 
>