> On Tue, Apr 5, 2016 at 4:34 PM, Grumbach, Emmanuel
> <emmanuel.grumbach@xxxxxxxxx> wrote:
> > On Tue, 2016-04-05 at 16:25 +0300, Gucea Doru wrote:
> >> On Tue, Apr 5, 2016 at 1:00 PM, Grumbach, Emmanuel
> >> <emmanuel.grumbach@xxxxxxxxx> wrote:
> >> > >
> >> > > Hello,
> >> > >
> >> > > I am trying to capture packets that are exchanged between an AP
> >> > > and a smartphone on the 5Ghz frequency. For generating traffic, I
> >> > > upload UDP traffic from a laptop PC towards the smartphone using
> >> > > iperf.
> >> > >
> >> > > The problem is that I can see _only_ the control frames like
> >> > > RTS/CTS, Block ACK, while the data packets are not captured. I
> >> > > uploaded the Wireshark capture files at [1] (located inside the
> >> > > folders whose name starts with 5Ghz).
> >> >
> >> > Most likely the packets on A band have a VHT preamble and your SKU
> >> > is 11N only.
> >>
> >> My card, Intel 7260 [1] supports 802.11 ac. So it should also
> >> support VHT, right? Is there any interface in user-space for checking
> >> after VHT?
> >
> > 7260 has several flavors. The one you have doesn't support VHT:
> >> iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless N 7260
> >
> > Dual Band means you have support for 5.2GHz, but Wireless N, means no
> > VHT.
>
> One of my colleagues had an Intel 7260 AC card so I repeated the
> experiments:
> - if I set the channel width to 20Mhz from the AP and the monitor interface
> using the command iw wlan0 set freq 5240 HT20+ I can see data frames and
> the Block ACKs for these frames;
> - if I set the channel width to 40Mhz from the AP and the monitor interface
> using the command iw wlan0 set freq 5240 HT40- I can see data frames and
> the Block ACKs for these frames;
> - If I set the channel width to 80Mhz from the AP I don't how to set up the
> monitor interface. I tried with iw wlan0 set freq 5240 HT40+ but it tells me
> that the argument is invalid.
>
> Is the iwlwifi driver capable of capturing data frames when the channel
> bonding is set to 80Mhz?
dev <devname> set freq <control freq> [20|40|80|80+80|160] [<center freq 1>] [<center freq 2>]
You can take center_freq1 from the output of iw dev on a device that is associated to the same AP.
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