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[WIFI] Can I capture more that one channel per wifi Device

asked 2021-03-20 18:47:31 +0000

ASGR gravatar image

Hi Guys,

I would like to capture traffic in monitor mode on all wifi channels but when I try to do this with just one wifi device by creating new capture filters, I only get duplicate channel data when I select teh channel from the drop down menu.

Is this a physical limitation of the device and would I essentially need an array of wifi devices to capture each channel? This sounds expensive!

Thanks in advance.

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answered 2021-03-21 11:58:21 +0000

Bob Jones gravatar image

One radio == one channel, so no, you cannot capture more than one channel per device at the same time.

You would need one device for each channel you want to capture on, in general, so you could end up with an array that looks like a porcupine of antennas. But do you really need to capture on all channels at the same time? There are other constraints or strategies that come in to play or can be used to limit the problem. If you can get away with only sampling the channels, cycle through the channels as you capture. If you need all traffic to troubleshoot problems, maybe the device is only 2.4GHz, so in FCC region you would only need to capture 3 channels: 1,6, and 11. If you are on 5GHz with no DFS, that could be 9 channels. Hopefully, you can find some other ways to limit the amount of work to do. Note also that WiFi does not go that far; so for a given capture system to see ALL these channels at the same time, in close proximity with high signal strength of devices, would be unusual.

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There is some discussion of channel hopping in this Wireshark question.

Or maybe a #WiFiCactus?

Chuckc gravatar imageChuckc ( 2021-03-21 15:32:09 +0000 )edit

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Asked: 2021-03-20 18:47:31 +0000

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Last updated: Mar 21