[ath9k-devel] Capture A-MPDUs

[shinnazar <seytnazarovsho@ynu.ac.kr>]

 

 

From: Astrit Zhushi [mailto:a.zhushi at cs.ucl.ac.uk] 
Sent: Tuesday, August 06, 2013 6:01 PM
To: ath9k-devel at lists.ath9k.org
Subject: [ath9k-devel] Capture A-MPDUs

 

> 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.

May be you are missing to set the monitor flags using ?iw? utility. If so, here are some guidelines http://wireless.kernel.org/en/users/Documentation/iw?highlight=%28monitor%29#Modifying_monitor_interface_flags

> 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

 

- Nazar

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