Yes Henky, I observed the same using an identical setup. Linksys
WPC11, hostap and monitoring mode.
It seems that packets from other channels are visible, but got the
impression that when data is transmitted over the monitored channel,
not all traffic from neighbouring channels is seen.
Neighbouring channels is actually an euphymism. I use 2 channel 1 and
11 and can observe packets from one when capturing on the other.
To be complete, the machine I use to capture the packets is equiped
with 2 WNIC cards and captures on both channels using 2 different
tethereal processes.
I'm also very curious about what causes this and more important, how
to avoid this!
regards,
Peter
On Thu, 2 Dec 2004 23:17:05 +0800, Henky Jatmiko Gunawan
<eng10810@xxxxxxxxxx> wrote:
> Has anybody tried to sniff 802.11b control packets from neighbouring channels?
> I was sniffing on channel 6 but I seem to be able to get beacons from the neighbouring channels as well. Has anybody observed this?
>
> I was using Linksys WPC11 on hostap driver. I put it into monitor mode and set it to channel 6. I rotated my AP to provide service from channel 1 to channel 11, as I continue to sniff at channel 6. Strangely, ethereal seems to show that I have also captured beacons that are supposedly transmitted on other channels as well.
>
> As far as I know, I should only be getting packets from channel 6. An article from this mailing list also seems to suggest that:
> http://www.ethereal.com/lists/ethereal-users/200401/msg00012.html
>
> Regards,
>
> Henky
>
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