Return-path: Received: from mail-fx0-f223.google.com ([209.85.220.223]:36089 "EHLO mail-fx0-f223.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755956Ab0CXMNR convert rfc822-to-8bit (ORCPT ); Wed, 24 Mar 2010 08:13:17 -0400 Received: by fxm23 with SMTP id 23so3014201fxm.1 for ; Wed, 24 Mar 2010 05:13:15 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <69e28c911003240511l52ff05fdx38d1610ce9609bc5@mail.gmail.com> References: <33a0299c1003240143l23ecb9d4j8978ea585c50a0a2@mail.gmail.com> <69e28c911003240511l52ff05fdx38d1610ce9609bc5@mail.gmail.com> From: =?ISO-8859-1?Q?G=E1bor_Stefanik?= Date: Wed, 24 Mar 2010 13:12:55 +0100 Message-ID: <69e28c911003240512q3e23d653ye2ca50fabd724846@mail.gmail.com> Subject: Re: ath9k: packets sent twice 1Mbps & 54Mbps To: Anthony Cc: linux-wireless Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: 2010/3/24 G?bor Stefanik : > On Wed, Mar 24, 2010 at 9:43 AM, Anthony wrote: >> Hi all, >> I'm using: >> Ubuntu 9.10 >> Atheros card with ath9k >> compat-wireless latest stable version >> ad-hoc 802.11g with 2 nodes (same hardware & software configuration) >> >> I tried to inject packets using mac80211 (similar way as in packetspammer) >> Radiotap header contains only Flag=0 & Rate=1Mbps (total size = 14 bytes) >> However when I use wireshark to capture traffic, I discovered that >> each frame was sent twice: >> first time with 14 bytes radiotap header >> second time with 13 bytes of radiotap header (Rate omitted), so 54Mbps here. > > Are you sure it is not the AP relaying the packet? Sorry, I had a blonde moment and didn't notice that you are using adhoc. > >> >> Is this a problem of ath9k or a default feature of 802.11 ??? >> >> Another question: if I set the FCS flag to send frame with all zeros >> FCS, the receiver reported frame as bad FCS, but still deliver it to >> upper layer. Why? I think the frame should be discarded ? I want to >> simulate broken phy link by jamming FCS. Is there any alternative way >> ? >> >> Hope some one can help. >> >> Thank you. >> >> Anthony >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at ?http://vger.kernel.org/majordomo-info.html >> > > > > -- > Vista: [V]iruses, [I]ntruders, [S]pyware, [T]rojans and [A]dware. :-) > -- Vista: [V]iruses, [I]ntruders, [S]pyware, [T]rojans and [A]dware. :-)