Return-path: Received: from ol.sdf.org ([192.94.73.20]:52740 "EHLO sdf.lonestar.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757869AbcG0BOm (ORCPT ); Tue, 26 Jul 2016 21:14:42 -0400 From: Alan Curry Message-Id: <201607270114.u6R1EPxB018526@sdf.org> (sfid-20160727_031451_518082_633706B9) Subject: Re: PROBLEM: network data corruption (bisected to e5a4b0bb803b) In-Reply-To: <2589898.190WVraD7Z@debian64> To: Christian Lamparter Date: Wed, 27 Jul 2016 01:14:25 +0000 (UTC) CC: Alan Curry , Al Viro , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, alexmcwhirter@triadic.us MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-wireless-owner@vger.kernel.org List-ID: 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: ERP D4.0: 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