Wireshark-bugs: [Wireshark-bugs] [Bug 5294] New: in bssmap, track L3 handover target (GSM or UMT
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 13 Oct 2010 10:56:42 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5294

           Summary: in bssmap, track L3 handover target (GSM or UMTS)
                    between PDUs
           Product: Wireshark
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: wireshark@xxxxxxxxxxxxxxx


Build Information:
Paste the COMPLETE build information from "Help->About Wireshark", "wireshark
-v", or "tshark -v".
--
In bssmap, the L3 Infor IE needs to be dissected by the GSM or UMTS dissector
depending on the target cell RAT, but this is not always present in the PDU
being dissected.  This small patch tracks the last indicated RAT in the SCCP
stream, giving a better chance of choosing the correct dissector.

In the attached trace file (MTP3 option ITU), look at frame 15, the original
dissector code guesses that the target RAT is GSM, and the L3 info fails to
dissect.  The new dissector code remebers that the target cell (in frame 14) is
UMTS, and calls the correct dissector.  This only works if SCCP trace is
enabled, but it warns you if it is disabled.

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