Ethereal-dev: Re: [Ethereal-dev] sample file for GSM frames

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From: LEGO <luis.ontanon@xxxxxxxxx>
Date: Wed, 3 Aug 2005 20:05:47 +0200
Francisco,

If you are "capturing" on the UE you may have:
 IP over PPP  (R (GPRS))
 DTAP over nothing (a GSM debug dump on the UE)

If the case is the second you should:
+  generate a pcap file containing the payload and use one of the user
DLTs (147->162).
       text2pcap -l 147 input.txt output.pcap

+ configure ethereal to decode as TCAP that DLT.
    preferences->protocols->DLT User [ABCD]
    DLT: the one choosen
    payload: gsm_dtap

+ open the generated file.


Anders:
AFAIK in GSM,  MAP is used in B, C, D, E, F and G interfaces ( may be
even in the H but I do not know of an AuC not combined with the HLR ).


I attached a simple GSM network diagram so he can indicate on which
interface he's got the trace.

Luis

Attachment: gsmumts.png
Description: PNG image