Sarah M Rovito wrote:
> Hello! I am curious as to whether CIP motion is running/can be
> implemented
> over Ethernet. I would like to use Ethereal software and pose the
> question:
>
> Is Ethereal solely dependent on Ethernet (versus RS45 or other methods of
> data transmission)?
It's not solely dependent on Ethernet. It works with 802.11, ATM, FDDI,
Token Ring, PPP on serial links, and so on.
That does not, however, mean it will be capable of handling some arbitrary
link layer.
> Is what I am setting out to do possible?
In order to read a file containing traffic for a particular link layer,
captured by some other tool, Ethereal needs
code to read that file format (which would require either a
specification for that file format or enough captures and dissected
contents of those captures to allow reverse-engineering of the file
format);
code to dissect that link-layer protocol, and protocols running on top
of it, which could probably be added, given specifications for that
protocol.
In order to capture traffic for that particular link layer, rather than
just leaving the capturing to some other tool, Ethereal needs
support in the libpcap library for that link layer - which might
require that code be added to libpcap to handle a device to "snoop"
traffic for that link layer, if the OS on which you're capturing
doesn't support that through its "standard" capture mechanism;
support for the new libpcap link-layer type in Ethereal's file-reading
code;
the same code to dissect that link-layer protocol, and protocols
running on top of it, mentioned above.
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