AirPcap Nx issue

[V M <vm.mre.list () gmail com>]

I just bought an AirPcap Nx device but I can't get reliable data for 2.4GHz
802.11n networks.



The AP is configured for "Up to 130Mbps", client is configured for max
65Mbps, MCS7, 20MHz channel, 800ns GI, 1 spatial stream.


The network is open (no WEP or WPA).

I can see upstream frames (from client to AP) but no downstream frames,
except for ACKs and beacons.

I get a lot of invalid frames though (incorrect FCS), where downstream data
frames should be.



If I configure the AP for 802.11g ("up to 54Mbps") and client accordingly
(54Mbps) everything looks good.



I tested it using iperf configured for UDP @ 32Kbps, bidirectional.



Attached capture files were collected with Wireshark, using the following
versions:

Wireshark Version 1.8.1 (SVN Rev 43946 from /trunk-1.8) x64

Airpcap software version 4.1.1

WinPcap 4.1.1



I tried to contact riverbed on this issue with no luck.


Thanks,

Valerio

Attachment: Airpcap_11n_issue.zip
Description:

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