[Cerowrt-devel] [Bloat] capturing packets and applying qdiscs

Richard Smith smithbone at gmail.com
Fri Mar 27 14:13:17 EDT 2015

On 03/27/2015 01:21 PM, Aaron Wood wrote:

> Using the following filter in Wireshark should get you all that 6Mbps
> traffic:
> radiotap.datarate == 6

Thanks.  I'd not discovered that yet although I have so much of it that 
finding 6mbit packets is not much of a problem.

> Then it's pretty easy to dig into what those are (by wifi frame-type, at
> least).  At my network, that's mostly broadcast traffic (AP beacons and
> whatnot), as the corporate wifi has been set to use that rate as the
> broadcast rate.

Yeah. Beacons are supposed to be that low but that's only every 100ms.
On my network its there are loads of data packets that are sent at 6mbit.

> without capturing the WPA exchange, the contents of the data frames
> can't be seen, of course.

And this is where I seem to stall out.  Even when I capture the full WPA 
exchange I only have limited success at getting wireshark to decode all 
my traffic.

I have more success with using airdecap-ng decoding and then feeding 
that to wireshark but there are still times when it can't decode things 
and I can't see why.  The full WPA exchange is clearly visible in the 
packet capture.

Richard A. Smith

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