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From: =?ISO-8859-1?Q?G=E1bor_Stefanik?= <netrolller.3d@gmail.com>
Date: Wed, 24 Mar 2010 13:11:53 +0100
Message-ID: <69e28c911003240511l52ff05fdx38d1610ce9609bc5@mail.gmail.com>
Subject: Re: ath9k: packets sent twice 1Mbps & 54Mbps
To: Anthony <lazugau@gmail.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Content-Type: text/plain; charset=ISO-8859-1
Sender: linux-wireless-owner@vger.kernel.org

On Wed, Mar 24, 2010 at 9:43 AM, Anthony <lazugau@gmail.com> 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?

>
> 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
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