tcpdump mailing list archives

Re: C-Bus encapsulation type


From: "Daniel O'Connor" <Daniel.O'Connor () schneider-electric com>
Date: Thu, 29 Jun 2017 22:57:16 +0000


On 30 Jun 2017, at 03:21, Guy Harris <guy () alum mit edu> wrote:
Although the format is slightly different (hence the internal stuff).

If the capture program and dissector are solely for the use of Schneider and, possibly, its customers, and the 
dissector won't be open-source (which means "not a Wireshark dissector", given that Wireshark plugins have to be 
GPLed, unless the dissector is solely for use within Schneider), then a LINKTYPE_n/DLT_USERn value would be best.  I 
don't want to assign LINKTYPE_/DLT_ values to formats for which there isn't sufficient documentation for somebody to 
write code to parse the format (neither a tcpdump nor a Wireshark dissector counts as "documentation").

If the dissector will be open-source, then there's no reason not to have a publicly-available specification for the 
message format.

OK fair enough.

I am hoping to be able to make it more open but other people seem unreasonably paranoid about it so I'm not holding my 
breath :-/

--
Daniel O'Connor                   Senior Firmware Developer
Smart Devices Asia Pacific        M  0403070726
Building & IT Business            E  Daniel.O'Connor () schneider-electric com
33-37 Port Wakefield Road         Gepps Cross, SA, Australia

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