Wireshark-bugs: [Wireshark-bugs] [Bug 2718] New: Ethernet II with SFD and LLC ?
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 17 Jul 2008 03:20:48 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2718

           Summary: Ethernet II with SFD and LLC ?
           Product: Wireshark
           Version: 1.0.0
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: jboehm@xxxxxxxxxxxxxx


Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
I send VLAN-Frames over the Ethernet.

They are interpreted as Ethernet II Frames and Wireshark is still looking for
LLC.
(Just 802.3 Ethernet contains LLC)

Due to measurements on the bus I discovered that the preamble is followed by a
SFD byte. (Just 802.3 Ethernet uses SFD)

The following message is what Wireshark captured. 
*****************************************
+ Frame 160 (60 bytes on wire, 60 bytes captured)
- Ethernet II, Src: 02:00:01:00:00:01 (02:00:01:00:00:01), Dst:
02:00:01:00:00:01 (02:00:01:00:00:01)
  + Destination: 02:00:01:00:00:01 (02:00:01:00:00:01)
  + Source: 02:00:01:00:00:01 (02:00:01:00:00:01)
    Type: 802.1Q Virtual LAN (0x8100)
+ 802.1Q Virtual LAN, PRI: 3, CFI: 0, ID: 1
+ Logical-Link Control
+ Data (39 bytes)

*****************************************
Ethernet II contains LLC ? 
Ethernet II with preamble and SFD ?

What’s wrong?


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