Re: what's the meaning of 'Can't dissect FP frame because no per-frame info was attached!'

[Martin Andersson <hello.martin () ownit nu>]

It should be possible with some minor/medium effort (well I don't do the 
programing, else it would be major :), to make the dissector work with 
ATM as well.
It's "only" a question of making the mapping to right AAL2 (instead of 
following the UDP frame, reading the Q.2630 and follow the AAL2).

/Martin

PS. Wireshark today follow the FH very well even with encryption, it's 
to follow RLC-SDU that's problematic when ciphering is enabled. DS.


On 11/09/2012 06:40 AM, Anders Broman wrote:
> damker skrev 2012-11-09 04:03:
> > I create a packet base at ERF/ATM AAL2  to dissect UMTS FP,the UMTS 
> > FP data is real data, but it says 'Can't dissect FP frame because no 
> > per-frame info was attached!' , is that something should define 
> > before umts fp?
> In order to dissect FP you need to have information about how channels 
> are set up etc
> See http://wiki.wireshark.org/FP
> http://ask.wireshark.org/questions/12388/could-you-tell-me-how-to-dissect-fp-over-udp
> http://ask.wireshark.org/questions/11913/how-to-use-umts-fp-dissector
> http://ask.wireshark.org/questions/6414/message-cant-dissect-fp-frame-because-no-per-frame-info-was-attached
>
> http://wiki.wireshark.org/RLC
> /*****************************************************************/
> /* UDP framing format */
> /* ----------------------- */
> /* Several people have asked about dissecting RLC by framing */
> /* PDUs over IP.  A suggested format over UDP has been defined */
> /* and implemented by this dissector, using the definitions */
> /* below. A link to an example program showing you how to encode */
> /* these headers and send RLC PDUs on a UDP socket is provided */
> /* at http://wiki.wireshark.org/RLC */
> /* */
> /* A heuristic dissecter (enabled by a preference) will */
> /* recognise a signature at the beginning of these frames. */
> /* Until someone is using this format, suggestions for changes */
> /* are welcome. */
> /*****************************************************************/
>
> Recently code has been added to the NBAP dissector to set up the 
> information needed to
> dissect FP if the NBAP set up signalling is present in the trace, this 
> works for some cases
> if no encryption is used.
> Regards
> Anders
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