Wireshark mailing list archives
Re: Question about displaying of Sequence Number of GTP v2
From: Pascal Quantin <pascal () wireshark org>
Date: Thu, 4 Jun 2020 17:23:13 +0200
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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Current thread:
- Question about displaying of Sequence Number of GTP v2 Дмитрий Кондратьев (Jun 04)
- Re: Question about displaying of Sequence Number of GTP v2 Pascal Quantin (Jun 04)
- Re: Question about displaying of Sequence Number of GTP v2 Tomasz Moń (Jun 04)