Wireshark-bugs: [Wireshark-bugs] [Bug 3657] Need workaround for packets with an FCS and with "FC

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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 07 Mar 2013 04:54:19 +0000

changed bug 3657

What Removed Added
Component Wireshark Dissection engine (libwireshark)
Hardware x86 All
Assignee [email protected] [email protected]
Summary FCS not detected, even if "Assume packets have FCS" is checked Need workaround for packets with an FCS and with "FCS present" not set in the radiotap header

Comment # 2 on bug 3657 from 
(In reply to comment #0)
> Based on this data, I believe there is a bug on detecting the FCS, maybe
> related to the Radiotap header

Yes, it's related to the radiotap header having a flags field with the "FCS
present" flag not being set.  Either the driver for the adapter is broken
(supplying the FCS but not setting the "FCS present" flag), or whatever program
is writing the capture is gratuitously clearing the "FCS present" flag.

Perhaps the should be a preference for the radiotap dissector to specify that
the "FCS present" flag should be ignored and the FCS assumed to be present.

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