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

["Sid Sid" <ysidelnikov@xxxxxxxxxxx>]

Do you have a plan to fix it ?
I guess it will be very useful because high level dissector can't show 
properly session data PDUs which are always segmented on COTP level. Only 
short one - connection request/confirm/refuse and so on.
Pretty useless dissector, isn't ?
I have a plan to develop dissectors for next levels - including 
association,ACSE,FTAM etc.
I reckon it is imposible without good COTP reassembling.


> 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.
>
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