Your frame 9 dissection errors out (as malformed), which probably trips up the 
TCP dissector as well, not allowing it to do all it’s work after the payload 
dissector is done.

Thanks,
Jaap

> On 29 Nov 2018, at 13:34, David Arnold <[email protected]> wrote:
> 
> Hi all,
> 
> I’ve discovered an odd issue with my dissector, and I’d really appreciate 
> some debugging pointers.
> 
> I have a capture file (attached) which, when viewed without any explicit 
> decoding, looks just fine — in particular, all the TCP seq/ack numbers appear 
> reasonable, and don’t flag any errors.  When I set the “Decode As …” option 
> to “SoupBinTCP” (the appropriate protocol), I start to see some errors with 
> the TCP sequence numbers.
> 
> Specifically, the reported (relative) sequence numbers are fine for the first 
> 8 packets in the capture, but on the 9th packet, the *reported* value is 
> screwy, and all subsequent packets are therefore messed up too.  The bogus 
> reported value is not reflected in in the shown packet bytes, which look 
> consistent with other packets.
> 
> I’m testing using a recent clone of Git master, but have also reproduced the 
> problem on v2.1.0 (which I had installed on a handy machine), so it’s not a 
> new problem.
> 
> Any suggestions for what might be going wrong much appreciated.
> 
> Thanks in advance,
> 
> 
> 
> 
> d
> 

Attachment: tradenow.pcap
Description: Binary data

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