From Filipe David Borba Manana:

From Filipe David Borba Manana:
Since it was named Ethereal and up to today, Wireshark wrongly parses
the IPv4 header flags field:
* it considers it as a 4 bits wide field - according to RFC 791 its a 3 bits
wide field (first 3 bits of the 6th octect of the IPv4 header).
* if for example the DF bit is set, Wireshark displays the flag value as 0x04
(0100) when it should be 0x02 (010), idem for the MF flag.
Attached to this bug report, you can find a patch to fix the issue.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@30855 f5534014-38df-0310-8fa8-9805f1628bb7