Re: Question about displaying of Sequence Number of GTP v2

[Pascal Quantin <pascal () wireshark org>]

Hi,

Le jeu. 4 juin 2020 à 17:11, Дмитрий Кондратьев <dobreczasy () yandex ru> a
écrit :

> Good afternoon all.
> Recently I discovered that the parameter Sequence Number for GTP v2
> protocol is displayed in such way: "Sequence Number: 0x00ffffff (16777215)"
> But if you see specs then it is stated that Sequence Number is 24-bit
> field. From my perspective, it doesn't make sense to include two lead zeros.
> Am I missing something? Is it a small UI bug?
> Thank you in advance!

There are several sequence numbers in the GTPv2 specification.
The one specified in 3GPP 29.274 chapter 8.114 is 4 bytes long and this is
the one matching the gtpv2.sequence_number filter.
The one from the header is 3 bytes long and is using the gtpv2.seq filter.
It is wrongly displayed as a FT_UINT32 instead of FT_UINT24. I guess this
is the one you are looking at. THanks for the report, it is addressed in
https://code.wireshark.org/review/#/c/37379/

Best regards,
Pascal.

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