Re: ath client bridge

On Oct 20, 2005, at 3:52 AM, Andrew Atrens wrote:

> Jim Thompson wrote:
>
>> Now, answer this question: Where do you send the ACKs when SA != TA?
>>
>
> SA I'm guessing. (Only one second of thought though :)). You'd  treat
> SA like a layer2 gateway.

If you don't send an ACK back to TA, then TA will retry (potentially  
several times).

(So the answer is 'TA'.)

>>> There is a four address version of the packet header, but as I   
>>> recall the fourth
>>> address is used by TKIP.
>>>
>> nope.
>>
>
> Thanks. My answer was based on just snoopinig around in the  
> net80211 source
> code - the only usages I found of ieee80211_frame_addr4 were in  
> crypto_ccmp and
> crypto_tkip.

because the net80211 code that implements WDS hasn't escaped the lab  
(yet).

>
>>>
>>> So it's a problem with 802.11 standard. I think that's why they   
>>> came up with WDS.
>>> I think there's some support for WDS in MadWiFi, but not yet in  
>>> the  BSD stack(s).
>>>
>> As the term is commonly used, WDS *is* the 4-address frame format.
>>
>
> Makes sense. Thought there might be more to it than that, for  
> instance AP's
> tracking/coordinating with other AP's with the same ssid and  
> channel. But
> I really haven't looked at it, to be completely honest. :)
>
> I know that when I put my laptop in AP mode (same channel and ssid  
> as my master
> AP), on the laptop, I stop hearing packets coming from my master AP.

The two APs have no (current) method to send packets to each other  
across the wireless media.

Jim