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Why I cannot see anything when I use this wlan.fc.type filters?

asked 2020-08-11 20:05:16 +0000

mertdurdagi gravatar image

updated 2020-08-11 20:51:32 +0000

Hello,

I am trying to draw a pie chart of management, control and data frames of a 10 minutes of Wi-Fi traffic. After I stop the capturing, I write;

wlan.fc.type==0 for management frame,

wlan.fc.type==1 for control frame and

wlan.fc.type==2 for data frame

to the filtering area.

However, I get a completely white window, showing me nothing out of all packages. Anybody knows why? It would be great to see a reason...

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Maybe you weren't capturing in monitor mode and only have Ethernet pseudo-headers? If you apply a display filter of just wlan.fc.type, do you get any matching packets?

cmaynard gravatar imagecmaynard ( 2020-08-11 20:18:56 +0000 )edit

Exactly sir, I do not even know how to switch to the monitor mode. This is my homework but it wasn't taught me before...

No, when I apply that filter, I do not see any packets

mertdurdagi gravatar imagemertdurdagi ( 2020-08-11 20:48:26 +0000 )edit

Have a look at the WLAN (IEEE 802.11) capture setup wiki page for information that should help you with this.

NOTE: The wiki is scheduled for migration to GitLab today, so once migrated, I don't know if this URL will redirect you to the new location or not.

cmaynard gravatar imagecmaynard ( 2020-08-11 20:53:15 +0000 )edit

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answered 2020-08-12 05:55:02 +0000

Guy Harris gravatar image

If, below the "Frame" line at the top of the packet detail display, the next item at the same level is "Ethernet", then the capture got "fake Ethernet" packets rather than 802.11 packets, which usually means the capture wasn't done in monitor mode.

Here's the WLAN (IEEE802.11) capture setup Wireshark Wiki page, at its new GitLab location.

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Asked: 2020-08-11 20:05:16 +0000

Seen: 46 times

Last updated: Aug 12