[ath9k-devel] Capture A-MPDUs

[Tsaixiong <ivycx1992@gmail.com>]

Astrit Zhushi <a.zhushi <at> cs.ucl.ac.uk> writes:

> 
> Hi,
> I need to capture aggregate MPDUs between an AP and a client (both running 
iwlwifi driver). I have a monitoring node running Atheros AR9300 (MiniPCIe) 
card with a monitoring interface setup. The problem is that aggregated data 
frames (A-MPDUs) being sent from AP to the client are not being captured at the 
monitoring node, only control frames (CTS,BlockAck). Of course, if AP transmits 
to the monitoring node then aggregates can be captured.
> 
> My question is that is this a hardware limitation? I suspect that the card is 
not passing to the driver aggregated frames that are not destined to itself. 
Does this has to do with any state the card has to keep for aggregation? 
Finally, if that is the case can the card be instructed to pass all aggregated 
frames without keeping any state?
> 
> I am looking at the number of frames that are aggregated on a typical WLAN. 
While this can be inferred by looking at BlockACKs, seeing actual aggregates 
would be helpful as a sanity check.
> 
> Thanks,
> 
> Astrit
> 
> 
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> 

Dear Astrit

I am confronting with the same problem!Can you give some advice on where I 
can capture the control frame in mac80211?I want to confirm the 
receiver ,transimitter and duration of next data frame.
 
Thanks in advance.
Tsaixiong