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tshark filter wlan.fcs.status==1 does not work with v3.0.2,

asked 2019-06-18 01:04:18 +0000

Sudheer gravatar image

updated 2019-06-18 01:11:19 +0000

I use tshark to read packets and remove valid ones with the filter option "wlan.fcs.status == 1". However, that option does not work after installing newer Wireshark version v3.0.2. The same field does not even show up on Wireshark UI anymore. Is there a new filed option that I can use with tshark to remove FCS failed packets.

The error I see from Wireshark UI is that under the 802.11 MAC header, the FCS status is marked as "Unverified". Whereas previous versions would report "Good" or "Bad".

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I found that it is tied to the default setting on Wireshark v3.0.2 with Preferences > Advances > wlan.check_checksum is set to FALSE. On previous versions, it is set to TRUE.

Is there any option to enable wlan checksum verification while reading packets using shark ?

Sudheer gravatar imageSudheer ( 2019-06-18 01:27:49 +0000 )edit

What do you mean by "shark"? Do you mean Wireshark, TShark, or some other program?

Guy Harris gravatar imageGuy Harris ( 2019-06-18 03:59:54 +0000 )edit

I meant tshark (auto-correct changed it to shark). I was able to figure out the answer by using a tshark option to edit preference settings. tshark -o "wlan.check_checksum:TRUE"

Sudheer gravatar imageSudheer ( 2019-06-19 06:46:14 +0000 )edit

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answered 2019-06-19 06:46:55 +0000

Sudheer gravatar image

I was able to figure out the answer by using a tshark option to edit preference settings. tshark -o "wlan.check_checksum:TRUE"

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which through the GUI is >> Preference >> Advanced and then double clicking on the value field of wlan.check_checksum (if it is false)

pm89 gravatar imagepm89 ( 2019-10-28 19:32:04 +0000 )edit

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Asked: 2019-06-18 01:04:18 +0000

Seen: 708 times

Last updated: Jun 19 '19