Wireshark-bugs: [Wireshark-bugs] [Bug 4036] New: not all de-fragmented packets saved when saving
Date: Mon, 21 Sep 2009 02:42:16 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4036

           Summary: not all de-fragmented packets saved when saving
                    'displayed' packets
           Product: Wireshark
           Version: 1.2.0
          Platform: Other
        OS/Version: Windows XP
            Status: NEW
          Severity: Major
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Build Information:
Version 1.2.0 (SVN Rev 28753)

Copyright 1998-2009 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 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 Jun 15 2009), with
AirPcap.

Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1
beta5
(packet.dll version 4.1.0.1452), based on libpcap version 1.0.0, 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.
--
When you apply a display filter, it could be that some de-fragmented packets
get fragmented by WireShark (which is very nice).

However, when you then save with the option 'displayed packets', then only the
displayed packets are saved, but unfortunately the packets that are part of the
de-fragmentation are not saved along. 

So when you later on open the saved trace, then Wireshark obviously can no
longer do the fragmentation ... and you have lost a part of the trace.

Eg:
 frame nbr 3744 and 3745 are de-fragmented packets
 using display filter "sip", Wireshark will only show frame nbr 3745, but when
you click on frame nbr 3745 the full fragmented content is shown (so 3744 +
3745)
 then I save with the option "save displayed packets"
 later on, I open the file and only frame 3745 is in there :(


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