Re: A puzzled maintainer with questions regarding

["M.Baris Demiray" <barisdemiray () gmail com>]

Hello,

On Thu, Feb 3, 2011 at 9:51 PM, Guy Harris <guy () alum mit edu> wrote:
> On Jan 19, 2011, at 1:02 AM, M.Baris Demiray wrote:
>
> > First of all, we're developing radio communication software,
> > particularly STANAG 5066. Alongside the serial interface for the modem
> > interface our implementation also has a socket interface for testing
> > purposes.
> >
> > Now we have the need of saving STANAG 5066 PDUs into .pcap files to
> > analyze them later using our experimental STANAG 5066 DPDU (Data
> > Transfer Sublayer PDU) dissector. My ex-colleague, who wrote the
> > dissector, wrote it for the purpose of dissecting DPDUs captured from
> > the socket interface with prepending TCP header. But I, as the new
> > maintainer of this dissector, need to dissect raw STANAG 5066 PDUs now
> > since I modified the Data Transfer Sublayer (of STANAG 5066)  to
> > maintain a .pcap file and to save incoming DPDUs into this file with
> > relevant record headers.
>
> OK, what do you mean by "raw STANAG 5066 PDUs"?
>
>        http://www.isode.com/whitepapers/stanag-5066.html

As stated in the Isode white paper there may or may not be an
encryption device placed between STANAG 5066 Server and the HF Modem
but in both ways the interface of STANAG 5066 Server and HF Modem or
the encryption device is defined as RS-232 in STANAG 5066 Annex E. For
testing purposes we implemented a TCP/IP interface between STANAG 5066
Servers (among two MAC layers) to let developer test her code without
a need of a modem or a radio before passing it to someone else for the
later test steps. That's why the dissector we had before was looking
for a TCP header in front of the STANAG 5066 DPDUs. And what I tried
to mean by "raw STANAG 5066" was a DPDU with no prepending TCP header.

> says "At the modem level, STANAG 5066 uses packets (DPDUs) of a size appropriate to the modem speed."  Are those the 
> raw PDUs?
>
> It also speaks of the "SIS protocol", which appears to be the low-layer protocol used to communicate with the "STANAG 
> 5066 server", which appears to act as a gateway between applications and the STANAG 5066 radio layer.-

Exactly,

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-- 
M. Baris Demiray
-
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