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. > > However, I noticed a "failure" message in dmesg: > [ 4.030428] Intel(R) Wireless WiFi driver for Linux, in-tree: > [ 4.030570] iwlwifi 0000:04:00.0: irq 37 for MSI/MSI-X > [ 4.030760] iwlwifi 0000:04:00.0: Direct firmware load for > iwlwifi-7260-10.ucode failed with error -2 > [ 4.035509] iwlwifi 0000:04:00.0: loaded firmware version > 25.228.9.0 op_mode iwlmvm > [ 4.454772] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band > Wireless N 7260, REV=0x144 > [ 4.454825] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled > [ 4.455055] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled > [ 15.049933] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled > [ 15.050269] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled > > Also, the maximum bit rate reported by iwconfig is 150 Mb/s, so my > assumption is that the card can't enter into the 802.11 ac mode, it > just stays into 802.11n. > > doru@doru-N551JK:~$ iwconfig wlan0 > wlan0 IEEE 802.11abgn ESSID:"5_mptcp" > Mode:Managed Frequency:5.24 GHz Access Point: > C4:6E:1F:4B:10:A2 > Bit Rate=150 Mb/s Tx-Power=22 dBm > Retry short limit:7 RTS thr:off Fragment thr:off > Power Management:on > Link Quality=70/70 Signal level=-36 dBm > Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 > Tx excessive retries:0 Invalid misc:22 Missed beacon:0 > > > [1] http://www.intel.com/content/www/us/en/wireless-products/dual-ban > d-wireless-ac-7260-bluetooth-brief.html > > > Another option is that the traffic uses LDPC encoding and this > > device doesn't support it. > > > > > > > > > > If I use the 2.4 frequency, all the frames are captured. I also > > > uploaded the > > > Wireshark packet traces for 2.4Ghz at [1] (located inside the > > > folders whose > > > name starts with 2.4 Ghz). > > > > > > Is this a known bug or am I doing something wrong? > > > > > > Additional details: > > > Wi-Fi card: iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band > > > Wireless N 7260, > > > REV=0x144 Firmware version: iwlwifi 0000:04:00.0: loaded firmware > > > version > > > 25.228.9.0 op_mode iwlmvm > > > Traffic encryption: WPA & WPA2 Personal > > > Setting up the card in wireless mode: > > > ip link set dev wlan0 down > > > iw wlan0 set type monitor > > > ip link set dev wlan0 up > > > iw wlan0 set freq 5240 > > > > > > [1] https://drive.google.com/open?id=0B5SBH08PU_Chek9rOHY0VkxFRUE > > > > > > Thank you, Doru��.n��������+%������w��{.n�����{���zW����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
