Wireshark · Wireshark-users: Re: [Wireshark-users] what's the meaning of 'Can't dissect FP frame because no per-frame info was at

[Martin Andersson <hello.martin@xxxxxxxx>]

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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