Ethereal-dev: Re: [Ethereal-dev] OSI Session dissector in the works

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From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Tue, 9 Sep 2003 13:52:37 -0700

On Sep 9, 2003, at 1:34 AM, Sid Sid wrote:
Now I've got recent version. But something is still wrong with reassembling segmentent COTP PDUs. Please, have a look to attached capture file - clnp_.I mean frames 8-16.Frame 8 is the first and frame 16 last COTP segmented PDUs.
No, frames 10, 12, 14, and 16 are the segments of a segmented PDU to dst-ref 0x0001. Frame 8 is a non-segmented PDU to dst-ref 0x0101 (i.e., it's going in the other direction).
The problem is that the reassembly code assumes that sequence numbers in a segmented packet start at 0; unfortunately, the sequence numbers in COTP are PDU numbers, and those are connection sequence numbers that increase sequentially, so the first segment of a segmented PDU doesn't have a sequence number that starts at 0. 

That will require more work in the reassembly code to fix.