Wireshark-bugs: [Wireshark-bugs] [Bug 4408] New: .VN format, incorrect decode of PPP encoded wit
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 20 Jan 2010 04:03:39 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4408

           Summary: .VN format, incorrect decode of PPP encoded with
                    RFC2364-LLCMUX
           Product: Wireshark
           Version: 1.2.5
          Platform: x86
        OS/Version: Windows 2000
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: mantovani@xxxxxxxx


Created an attachment (id=4158)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4158)
.vn trace of PPP RFC2364-LLCMUX

Build Information:
Version 1.2.5 (SVN Rev 31296)

Copyright 1998-2009 Gerald Combs <gerald@xxxxxxxxxxxxx> 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 with GTK+ 2.16.2, with GLib 2.20.3, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8,
with c-ares 1.6.0, with Lua 5.1, with GnuTLS 2.8.1, with Gcrypt 1.4.4, with MIT
Kerberos, with GeoIP, with PortAudio V19-devel (built Dec 17 2009), with
AirPcap.

Running on Windows 2000 Service Pack 4, build 2195, with WinPcap version 4.1.1
(packet.dll version 4.1.0.1753), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.8.1, Gcrypt 1.4.4, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 30729

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

Check the man page and http://www.wireshark.org for more information.
--
I usually analyze PPP traces captured in .VN format.

Up to now all those traces contained PPP with RFC2364-VCMUX encapsulation,
decode was perfect.

Today I got trace of a line which is working without problems with
RFC2364-LLCMUX encapsuation and wireshark is not able to decode it. 

It shows:
1    0.000000    DTE    DCE    0xfefe    PPP Unknown (0xfefe)
same error for every packet.

According to RFC2364 http://www.ietf.org/rfc/rfc2364.txt chapter 6 the
encapsulation is correct, and in fact the line is working.

Either the file is incorrect or wireshark decodes it wrongly.
I attach the trace.
Thank you beforehand.

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