[question] ath9k: 11n monitor mode

[question] ath9k: 11n monitor mode

[Ming Lei]

Hi Luis,

I find the wireshark can only capture 11b/g packets but any 11n packets over
my ar9283 card, and I can confirm I have set HT40+ to make it work in 11n mode.

wireshark : 1.2.2
kernel       : 2.6.32-rc6

I don't know what is wrong with it, and could ath9k work well in monitor
mode of 11n?  or other reason?

Look forward to your reply.

Thanks,

-- 
Lei Ming

Re: [question] ath9k: 11n monitor mode

[Gábor Stefanik]

I don't know exactly, but a while ago there was a discussion about how
to represent HT rates in Radiotap. AFAIK mac80211 refuses to forward
HT packets to monitor interfaces as they don't have a valid CCK or
OFDM rate.

On Thu, Nov 26, 2009 at 2:57 PM, Ming Lei <tom.leiming@gmail.com> wrote:
> Hi Luis,
>
> I find the wireshark can only capture 11b/g packets but any 11n packets over
> my ar9283 card, and I can confirm I have set HT40+ to make it work in 11n mode.
>
> wireshark : 1.2.2
> kernel       : 2.6.32-rc6
>
> I don't know what is wrong with it, and could ath9k work well in monitor
> mode of 11n?  or other reason?
>
> Look forward to your reply.
>
> Thanks,
>
> --
> Lei Ming
> --
> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
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>



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Re: [question] ath9k: 11n monitor mode

[Luis R. Rodriguez]

2009/11/26 Gábor Stefanik <netrolller.3d@gmail.com>:
> I don't know exactly, but a while ago there was a discussion about how
> to represent HT rates in Radiotap. AFAIK mac80211 refuses to forward
> HT packets to monitor interfaces as they don't have a valid CCK or
> OFDM rate.

Matteo added a suggested field for radiotap for MCS rates:

http://www.radiotap.org/suggested-fields/MCS

If approved it could mean then parsing MCS rates.

  Luis

Re: [question] ath9k: 11n monitor mode

[Ming Lei]

2009/11/27 Luis R. Rodriguez <lrodriguez@atheros.com>:
> 2009/11/26 Gábor Stefanik <netrolller.3d@gmail.com>:
>> I don't know exactly, but a while ago there was a discussion about how
>> to represent HT rates in Radiotap. AFAIK mac80211 refuses to forward
>> HT packets to monitor interfaces as they don't have a valid CCK or
>> OFDM rate.
>
> Matteo added a suggested field for radiotap for MCS rates:
>
> http://www.radiotap.org/suggested-fields/MCS

Oh, I see.

Is there any patch which may let mac80211 forward HT packets to
monitor interface now?
If there is, where could I find it?

thanks,

-- 
Lei Ming

Re: [question] ath9k: 11n monitor mode

[Johannes Berg]

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On Fri, 2009-11-27 at 09:37 +0800, Ming Lei wrote:
> 2009/11/27 Luis R. Rodriguez <lrodriguez@atheros.com>:
> > 2009/11/26 Gábor Stefanik <netrolller.3d@gmail.com>:
> >> I don't know exactly, but a while ago there was a discussion about how
> >> to represent HT rates in Radiotap. AFAIK mac80211 refuses to forward
> >> HT packets to monitor interfaces as they don't have a valid CCK or
> >> OFDM rate.
> >
> > Matteo added a suggested field for radiotap for MCS rates:
> >
> > http://www.radiotap.org/suggested-fields/MCS
> 
> Oh, I see.
> 
> Is there any patch which may let mac80211 forward HT packets to
> monitor interface now?
> If there is, where could I find it?

It will forward all frame that it gets from the driver, just not tell
you it was an HT frame in radiotap since there's no way to -- you'll see
a frame without rate information.

johannes

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