TCAP SRT incorrectly matches TC_BEGINs and TC_ENDs

[Conall Prendergast <conall.prendergast () anam com>]

Hi All,

I have been analyzing a TCAP trace with wireshark with the tcap.srt and
tcap.persistentsrt options set to "TRUE".

This should correctly match TCAP Begins (using 2 pass analysis) with their
associated TCAP Ends, and vise-versa.

I have attached two files, "correct_matches.pcap" and
"incorrect_matches.pcap", that demonstrate some spurious behavior. These
two files are from the same feed, and "correct_matches.pcap" contains
packets 5, 11, 15, and 19 from "incorrect_matches.pcap".

"correct_matches.pcap" will correctly match packet 1 (TC_BEGIN) with packet
4 (TC_END), and packets 2 and 3 similarly, however, when these packets are
analysed with the rest of the feed (incorrect_matches.pcap), these very
same packets do not match up.

Instead, packet 5 (packet 1 from "correct_matches") matches with packet 15
(3) instead of packet 19 (4).

As you can guess, this is unexpected behavior.

So in summary, correct_maches.pcap contains:
1 => 4
2 => 3

incorrect_matches contains:
5 => 15
11 => x
x => 19

and the mapping of correct_matches to incorrect_matches is:
1 => 5
2 => 11
3 => 15
4 => 19


Any and all help is appreciated.
Thanks,
Conall

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Attachment: correct_matches.pcap
Description:

Attachment: incorrect_matches.pcap
Description:

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