Wireshark-bugs: [Wireshark-bugs] [Bug 6366] New: inner tag of 802.1ad frames not parsed properly
Date: Tue, 20 Sep 2011 11:43:27 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6366

           Summary: inner tag of 802.1ad frames not parsed properly
           Product: Wireshark
           Version: 1.6.1
          Platform: x86
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Major
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Created an attachment (id=7058)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=7058)
if the outer tag is 88a8 and inner tag is something other then 88a8 (8100
here), the information in the inner tag is not displayed correctly.  in the
example the inner tag has ether type 8100 (802.1q)

Build Information:
Version 1.6.1 (SVN Rev 38096 from /trunk-1.6)

Copyright 1998-2011 Gerald Combs <[email protected]> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (32-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jul
18 2011), with AirPcap.

Running on Windows Server 2003 Service Pack 2, build 3790, with WinPcap version
4.1.2 (packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
when outer ether tag 88a8 is parsed, if the inner tag is something other then
88a8, the information is not parsed/displayed properly.  i think this is
because wireshark asumes that the inner tag will also be 88a8.  when both inner
and outer tags are 88a8 ethertype, the two tags are grouped/displayed together.
 my suggestion would be to remove this grouping and always show each tag
independently.  if the outer tag is 88a8, only show id, pcp and cfi for this
tag.  then, show the inner tag according to the inner tag ethertype.  it's
quite normal to have outer tag 88a8 and inner tag 8100.  please see attachment
to see how if the outer tag is 88a8 and inner tag is something other then 88a8
(8100 here), the information in the inner tag is not displayed correctly.  in
the example the inner tag has ether type 8100 (802.1q), with ID 4095, CFI 1 and
priority 7, but this info is not displayed

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