* [ath9k-devel] Capture all transmissions with monitor interface
@ 2012-12-04 18:43 Julien Herzen
2012-12-05 5:45 ` Alex Hacker
0 siblings, 1 reply; 5+ messages in thread
From: Julien Herzen @ 2012-12-04 18:43 UTC (permalink / raw)
To: ath9k-devel
Hello,
I'm sending traffic from a node A to a node B, and I'm capturing traffic
sent by node A, at node A itself, using a monitor interface. I'm doing this
on lossy links, where many re-transmissions occur. It seems, however, that
each packet sent by A is captured only once (with our without retry bit
set). Is there a way to capture _all_ transmissions done by A?
I'm using AR9220 on Alix boards with kernel 2.6.32.27.
Thanks!
Julien
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* [ath9k-devel] Capture all transmissions with monitor interface
2012-12-04 18:43 [ath9k-devel] Capture all transmissions with monitor interface Julien Herzen
@ 2012-12-05 5:45 ` Alex Hacker
2012-12-05 8:55 ` Julien Herzen
2012-12-05 10:29 ` Julien Herzen
0 siblings, 2 replies; 5+ messages in thread
From: Alex Hacker @ 2012-12-05 5:45 UTC (permalink / raw)
To: ath9k-devel
On Tue, Dec 04, 2012 at 07:43:40PM +0100, Julien Herzen wrote:
> Hello,
>
> I'm sending traffic from a node A to a node B, and I'm capturing traffic
> sent by node A, at node A itself, using a monitor interface. I'm doing
> this on lossy links, where many re-transmissions occur. It seems, however,
> that each packet sent by A is captured only once (with our without retry
> bit set). Is there a way to capture _all_ transmissions done by A?
No, packets automatically generated by HW i.e. retries, acks, rts/cts is not
visible for the software. Only solution is to use node C in monitor mode next
to node A.
>
> I'm using AR9220 on Alix boards with kernel 2.6.32.27.
>
> Thanks!
>
> Julien
Best wishes,
Alex.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [ath9k-devel] Capture all transmissions with monitor interface
2012-12-05 5:45 ` Alex Hacker
@ 2012-12-05 8:55 ` Julien Herzen
2012-12-05 10:29 ` Julien Herzen
1 sibling, 0 replies; 5+ messages in thread
From: Julien Herzen @ 2012-12-05 8:55 UTC (permalink / raw)
To: ath9k-devel
Alex,
Thanks a lot for your answer.
Best,
Julien
On Wed, Dec 5, 2012 at 6:45 AM, Alex Hacker <hacker@epn.ru> wrote:
> On Tue, Dec 04, 2012 at 07:43:40PM +0100, Julien Herzen wrote:
> > Hello,
> >
> > I'm sending traffic from a node A to a node B, and I'm capturing
> traffic
> > sent by node A, at node A itself, using a monitor interface. I'm doing
> > this on lossy links, where many re-transmissions occur. It seems,
> however,
> > that each packet sent by A is captured only once (with our without
> retry
> > bit set). Is there a way to capture _all_ transmissions done by A?
>
> No, packets automatically generated by HW i.e. retries, acks, rts/cts is
> not
> visible for the software. Only solution is to use node C in monitor mode
> next
> to node A.
>
> >
> > I'm using AR9220 on Alix boards with kernel 2.6.32.27.
> >
> > Thanks!
> >
> > Julien
>
> Best wishes,
> Alex.
>
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* [ath9k-devel] Capture all transmissions with monitor interface
2012-12-05 5:45 ` Alex Hacker
2012-12-05 8:55 ` Julien Herzen
@ 2012-12-05 10:29 ` Julien Herzen
2012-12-05 15:53 ` abhinav narain
1 sibling, 1 reply; 5+ messages in thread
From: Julien Herzen @ 2012-12-05 10:29 UTC (permalink / raw)
To: ath9k-devel
Thanks for your reply,
Does this mean that a packet is passed to the monitor interface only once
it has been successfully ACK'd by the receiver? In this case, do you know
how to exactly interpret the retry bit of the packets received by the
monitor interface?
In particular, if the retry bit is set, does it mean that at least one
hardware (or software?) re-transmission occurred for this packet before it
has been successfully ACK'd ?
Thanks!
Best,
Julien
On Wed, Dec 5, 2012 at 6:45 AM, Alex Hacker <hacker@epn.ru> wrote:
> On Tue, Dec 04, 2012 at 07:43:40PM +0100, Julien Herzen wrote:
> > Hello,
> >
> > I'm sending traffic from a node A to a node B, and I'm capturing
> traffic
> > sent by node A, at node A itself, using a monitor interface. I'm doing
> > this on lossy links, where many re-transmissions occur. It seems,
> however,
> > that each packet sent by A is captured only once (with our without
> retry
> > bit set). Is there a way to capture _all_ transmissions done by A?
>
> No, packets automatically generated by HW i.e. retries, acks, rts/cts is
> not
> visible for the software. Only solution is to use node C in monitor mode
> next
> to node A.
>
> >
> > I'm using AR9220 on Alix boards with kernel 2.6.32.27.
> >
> > Thanks!
> >
> > Julien
>
> Best wishes,
> Alex.
>
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* [ath9k-devel] Capture all transmissions with monitor interface
2012-12-05 10:29 ` Julien Herzen
@ 2012-12-05 15:53 ` abhinav narain
0 siblings, 0 replies; 5+ messages in thread
From: abhinav narain @ 2012-12-05 15:53 UTC (permalink / raw)
To: ath9k-devel
On Wed, Dec 5, 2012 at 5:29 AM, Julien Herzen <j.herzen@gmail.com> wrote:
> Thanks for your reply,
>
> Does this mean that a packet is passed to the monitor interface only once
> it has been successfully ACK'd by the receiver? In this case, do you know
> how to exactly interpret the retry bit of the packets received by the
> monitor interface?
>
Yes.
> In particular, if the retry bit is set, does it mean that at least one
> hardware (or software?) re-transmission occurred for this packet before it
> has been successfully ACK'd ?
>
Yes.
-Abhinav
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2012-12-04 18:43 [ath9k-devel] Capture all transmissions with monitor interface Julien Herzen
2012-12-05 5:45 ` Alex Hacker
2012-12-05 8:55 ` Julien Herzen
2012-12-05 10:29 ` Julien Herzen
2012-12-05 15:53 ` abhinav narain
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