Christian Lamparter wrote:

Thanks, I gave the program a try with my WNDA3100 and a WN821N v2 devices.
I did not see any corruptions in any of the tests though. Can you tell me
something about your wireless network too? I would like to know what router
and firmware are you using? Also important: what's your wireless configuration?

The router/access-point is a Comcast-issued Technicolor cable modem, model
TC8305C. The only thing I can find on it that looks like it might identify
a firmware version is this:

    System Software Version

    eMTA & DOCSIS Software Version: 01.E6.01.22.25
    Packet Cable: 2.0

I assume Comcast pushes firmware updates whenever they feel like it.

There is possibly another clue. I get this message from the kernel sometimes:

    ieee80211 phy0: invalid plcp cck rate (0).

I had this message appearing long before the data corruption bug started.
It never correlated with any actual problems, so I turned down the priority
level of the message to get it off the console, and forgot about it. I
was unable to discover what a "plcp" or "cck" is so the message means
nothing to me.

(WPA?, CCMP or TKIP? HT40, HT20 or Legacy rates? ...)

Probably the quickest and easiest way to get that information is by running
the following commands as root, when you are connected to your wifi network
and post the results:
# iw dev wlan0 link
# iw dev wlan0 scan dump

Connected to cc:03:fa:bf:e9:ea (on wlan0)
	SSID: HOME-E9EA
	freq: 2462
	RX: 20726719 bytes (106483 packets)
	TX: 5902478 bytes (44707 packets)
	signal: -43 dBm
	tx bitrate: 54.0 MBit/s

	bss flags:	short-slot-time
	dtim period:	1
	beacon int:	100

BSS cc:03:fa:bf:e9:ea(on wlan0) -- associated
	TSF: 236407205748 usec (2d, 17:40:07)
	freq: 2462
	beacon interval: 100 TUs
	capability: ESS Privacy ShortSlotTime (0x0411)
	signal: -33.00 dBm
	last seen: 634452 ms ago
	Information elements from Probe Response frame:
	SSID: HOME-E9EA
	Supported rates: 1.0* 2.0* 5.5* 11.0* 18.0 24.0* 36.0 54.0 
	DS Parameter set: channel 11
	ERP: <no flags>
	ERP D4.0: <no flags>
	RSN:	 * Version: 1
		 * Group cipher: TKIP
		 * Pairwise ciphers: CCMP TKIP
		 * Authentication suites: PSK
		 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
	Extended supported rates: 6.0* 9.0 12.0* 48.0 
	HT capabilities:
		Capabilities: 0x18bd
			RX LDPC
			HT20
			SM Power Save disabled
			RX Greenfield
			RX HT20 SGI
			TX STBC
			No RX STBC
			Max AMSDU length: 7935 bytes
			DSSS/CCK HT40
		Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
		Minimum RX AMPDU time spacing: 8 usec (0x06)
		HT RX MCS rate indexes supported: 0-23
		HT TX MCS rate indexes are undefined
	HT operation:
		 * primary channel: 11
		 * secondary channel offset: no secondary
		 * STA channel width: 20 MHz
		 * RIFS: 1
		 * HT protection: nonmember
		 * non-GF present: 1
		 * OBSS non-GF present: 1
		 * dual beacon: 0
		 * dual CTS protection: 0
		 * STBC beacon: 0
		 * L-SIG TXOP Prot: 0
		 * PCO active: 0
		 * PCO phase: 0
	WPS:	 * Version: 1.0
		 * Wi-Fi Protected Setup State: 2 (Configured)
		 * Response Type: 3 (AP)
		 * UUID: 6d1b1911-14a9-391c-cdee-89850a5aa1ef
		 * Manufacturer: Technicolor
		 * Model: Technicolor
		 * Model Number: 123456
		 * Serial Number: 0000001
		 * Primary Device Type: 6-0050f204-1
		 * Device name: TechnicolorAP
		 * Config methods: Display
		 * RF Bands: 0x1
		 * Unknown TLV (0x1049, 6 bytes): 00 37 2a 00 01 20
	WPA:	 * Version: 1
		 * Group cipher: TKIP
		 * Pairwise ciphers: CCMP TKIP
		 * Authentication suites: PSK
		 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC (0x000c)
	WMM:	 * Parameter version 1
		 * u-APSD
		 * BE: CW 15-1023, AIFSN 3
		 * BK: CW 15-1023, AIFSN 7
		 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
		 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec

-- 
Alan Curry