Wireshark-bugs: [Wireshark-bugs] [Bug 7214] New: Decoding DOCSIS 3.0 Isolation DATA frames (FC_T
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sat, 28 Apr 2012 13:20:18 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7214

           Summary: Decoding DOCSIS 3.0 Isolation DATA frames (FC_TYPE=10)
           Product: Wireshark
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: gabor@xxxxxxxxx


Created attachment 8343
  --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8343
Docsis packet capture having sample isolation frames (#11,#12)

Build Information:
Version 1.6.7 (SVN Rev 41973 from /trunk-1.6)

Copyright 1998-2012 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 (32-bit) with GTK+ 2.24.10, with GLib 2.28.8, 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 2.12.18,
with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel
(built Apr  6 2012), with AirPcap.

Running on 32-bit Windows 7, build 7600, 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 2.12.18, 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.
--
Pre-DOCSIS3.0 protocols did not use FC_TYPE=10 MAC frames, it was "Reserved".
But DOCSIS3.0 has redefined FC_TYPE=10 as "Isolation Packet PDU MAC Header". It
carries normal ethernet frames as FC_TYPE=00 does and it should be decoded in
the same way.

Cisco uBR10k CMTSes send IGMPv3 general query packets in such isolation frames
to avoid IGMPv3 packets being forwarded by Pre-DOCSIS3.0 cable modems.

Wireshark should decode such isolation frames instead of displaying "Reserved
PDU".

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