<pete@spam-yourself.com> wrote in message news:99odav$5lm$5@inn.qnx.com…
Me <> paul.ryan2@nospam.virgin.net> > wrote:
I’m not sure if this is the correct group to address this at, if not,
please
tell me where to go (politely).
I wan’t to write a small io-net filter module which basically takes
ethernet
traffic from one interface and replays it immediately on another. The
machine should then act as a dumb bridge between two hardware domains. I
will endeavour to pick up a 3C90x driver with promisuous mode devctl
setting
so that all the traffic can be forwarded. Any ideas? Is there an easier
way
of doing this?
You’re talking to HW dudes. We would all just probably write some
code to crosswire the two cards DMA buffers and to hell with a driver.
Well, I am not only a HW dude (my title is Software Developer)…caution -
I am not QSSL either!
My (only partly informed) opinion is that this is likely the easiest way of
doing it, and it should work, but there are potentially a number of
difficult bridges to cross…
e.g. What level of protocol are you working at? if at the Ether Frame level,
will you be modifying the source/dest MAC addresses, or are you doing
effectively a hardware frame forwarder? will this cause problems with ARP
on any of the machines (source, bridge, destination)?
Can you do what you want under the io-net architecture? (My guess is - yes.
but it is only a guess)
Assuming you are “bridging” between en0 and en1 cards…
Scenario a.
Register as an up filter above each card. Question - can an up filter
inject packets in the downward going direction for an up producer?
Scenario b.
Register as a convertor above each card. Question - can you install two
converters on a single card? or will the fact that you have an IP-EN
converter already in place prevent you from doing this?
This is an example of the kinds of issues that you will likely be dealing
with, and I believe that you will get better answers from QSSL if you make
attempts to design what you want using the Network DDK documentation, and
then ask specific questions, rather than asking QSSL to get you started on
your design. (Not that you cannot ask them, mind you, it is just that I
feel that you will not get as fast or complete a response…)
Anyway, I hope that this has helped a little, rather than obfuscating the
issues.
Otherwise, it sounds like you’re talking about a plain old
application.
I guess nobody could figure out a polite way to tell you where to
go > 