Hello,
I've been digging in /sys/net80211 trying to find where things like beacons
are created and sent down to the driver. I found in ieee80211.h where the
non-data frames are defined and I can see in the different device drivers
where the frames are handled. But, for example, when you start an
On 8/30/05, Sam Leffler <[EMAIL PROTECTED]> wrote:
> David appears to be talking about how netbsd works. Understand that
> David does not work on FreeBSD; I'm not even sure he uses it.
...
> tcpdump and ethereal get the same data. If they display it differently
> given identical data then one is
On 8/29/05, Sam Leffler <[EMAIL PROTECTED]> wrote:
> Sam Pierson wrote:
> >I had some correspondence with the ethereal developers and David Young
> > and apparently there is a bug in how ethereal handles the radiotap header.
>
> News to me; the last time I checked it lo
Hi guys,
I'm trying to get an accurate measurement of signal strength (preferably
in dBm) on a per-packet basis between two atheros cards that I have. I
had some correspondence with the ethereal developers and David Young
and apparently there is a bug in how ethereal handles the radiotap header.
On 8/10/05, Sam Leffler <[EMAIL PROTECTED]> wrote:
> Sam Pierson wrote:
> > I noticed that when I control the signal strength through
> > ifconfig, I can effectively reduce the signal when I set it
> > as something like: ifconfig ath0 txpower 1. I have read
> >
Hi all,
I have been looking at this function in if_ath.c:
static void
ath_update_txpow(struct ath_softc *sc)
Is there an example somewhere of using this function in
a user-space application to control the signal strength?
Up until this point I've just been stringing together system()
calls sayin
or not
my originally intended txpow is still being respected.
-Sam
On 8/10/05, Sam Leffler <[EMAIL PROTECTED]> wrote:
> Sam Pierson wrote:
> > I noticed that when I control the signal strength through
> > ifconfig, I can effectively reduce the signal when I set it
> > as somethi
I noticed that when I control the signal strength through
ifconfig, I can effectively reduce the signal when I set it
as something like: ifconfig ath0 txpower 1. I have read
that this input is device driver dependent and I couldn't
find anything in the interface that handles txcontrol. Are
these
On 7/26/05, David Malone <[EMAIL PROTECTED]> wrote:
> That's correct, but it probably takes a few microseconds for the
> carries sense to kick in (if there wasn't a delay there would
> be almost no need for the random backoff). That's why you'll
> also have to have your transmissions synchronised v
On 7/21/05, Sam Leffler <[EMAIL PROTECTED]> wrote:
> You need to set cwmin on the tx q as David describes. Be sure to set
> the parameters you set into the hardware; check the wme update code for
> the correct logic. For the other thing just set the tx descriptor to do
> 1 try.
>
> Sam
> OK - you can probably achieve that by setting the retry limit to
> be 1, setting CWmin to be very small. However, you'll need to make
> sure that both machines transmissions are synchronised to better
> than 20us (which is no mean feat), otherwise carrier sense will
> foil your plan!
I just had
> You need to set cwmin on the tx q as David describes. Be sure to set
> the parameters you set into the hardware; check the wme update code for
> the correct logic. For the other thing just set the tx descriptor to do
> 1 try.
>
> Sam
Thanks guys. I'm still playing with these files so
> OK - you can probably achieve that by setting the retry limit to
> be 1, setting CWmin to be very small.
I was looking for this in the ah.h and the ah_desc.h files. Are they
someplace else, or maybe this is a system call? I can't find anything
about the retry limit (<-- CWmin = retry?) Thank
On 7/21/05, David Malone <[EMAIL PROTECTED]> wrote:
> On Wed, Jul 20, 2005 at 10:03:49PM -0500, Sam Pierson wrote:
> > I think there is still collision detection happening on the hardware
> > level. I think I have to disable the retransmission of frames
> > which
Hey all,
I'm working on a project that requires creating a single packet
collision between hosts, so I've been digging around in
/sys/contrib/dev/ath for awhile now. I successfully disabled the
CTS and RTS control frames from being transmitted, which
was the first step. I believe now the applic
Hey guys,
In a current project, I need to find out exactly how long it takes to send
a 802.11 packet and how much time is spent in the following stages:
send time - time spent constructing message, including context switches
and other delays and the time it takes to transfer the message to the
ne
I was curious if there was a way to use the if_ath.c file in order to change
transmission power on the fly in the middle of a program. This is in if_ath:
ath_hal_setuptxdesc(ah, ds
, pktlen/* packet length */
, hdrlen/* header len
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