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How to get noise level in 802.11 headers in Wireshark?

asked 2023-01-06 21:31:11 +0000

zane gravatar image

I am trying to do a measurement experiment in Wireshark with the WiFi card in monitor mode. I am expected to see a "noise level" field in the 802.11 header, but this seems to be missing. I do not see any SSI values in the Radiotap headers either. Do I have to enable something/do something extra to get these values to show up? These are the values I can see:

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answered 2023-01-07 19:27:23 +0000

Bob Jones gravatar image

The radiotap fields are defined at https://www.radiotap.org/fields/defined. As part of the radiotap header, there is a Present flags field which indicates the specific fields that are populated by the device and driver. Different devices populate / pass up to user space different items, sometimes depending on the type of frame received. If you don't see what you are looking for, I would say that the adapter and driver you are using is not providing it, so nothing Wireshark could do. Try a different adapter until you (hopefully) find the fields you are looking for.

I do not see any SSI values in the Radiotap headers

I assume you are referring to signal strength indicator(?) - if so, wouldn't the antenna signal fields in your screenshot show this?

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Yes. What the driver is providing is antenna signal - "the RF signal power at the antenna, in decibels difference from 1mW" ("dBm" means "decibels difference from 1mW") - but not antenna noise - "the RF signal power at the antenna, in decibels difference from 1mW", but I think they meant "RF noise power...".

Guy Harris gravatar imageGuy Harris ( 2023-01-12 03:11:41 +0000 )edit

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Asked: 2023-01-06 21:31:11 +0000

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Last updated: Jan 07 '23