Wireshark-bugs: [Wireshark-bugs] [Bug 2718] Ethernet II with SFD and LLC ?
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 18 Jul 2008 13:25:13 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2718





--- Comment #4 from Jürgen <jboehm@xxxxxxxxxxxxxx>  2008-07-18 13:25:08 PDT ---
"Ethernet II" vs. "802.3":

But that is wrong how Wireshark treats VLAN-frames! 
Wireshark has to handle VLAN frames different to the others. If Wireshark finds
in the Type/Length field 0x8100 (which is already part of the VLAN tag) it has
to check first the field behind the VLAN-tag before it can make a decision
about the Ethernet frame type.

Here is a picture of what I mean.
http://www.wildpackets.com/images/compendium/VLAN_Tag_GigaPeek.gif
The LLC could be length 0 (if T/L field contains a type)
The LLC could be length 3 (if T/L field contains a length)
The LLC (with SNAP) could be length 8 (if T/L field contains a length)


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