You should be able to strip out the ethernet code to move some of
it to the rtl side. 
S. Pink and his colleagues in Sweden came up with a great idea for routing
that could "easily" be adaped to RTLinux.
They used a dual processor system and put BSD on one processor and put 
a simple router that fit, with its routing table, in the L2 cache of the
second. the router polled the nics. Whenever the router could not figure
out how to route a message, it passed the message on to the other processor
to let BSD work on it. 
RTLinux could do this on a uniprocessor, losing the advantage of the L2
cache (except on a cyrix), but not needing to poll the nics.

On Mon, Mar 22, 1999 at 03:26:05PM +0000, Vicente Navarro wrote:
> Hi,
> 
> I am new in the RT Linux world. I have a question about RT drivers. How
> can I modify the PCI ethernet driver that comes with linux to implement
> a
> RT Ethernet driver ?. I am developing a some kind of router with RT
> features. I want to make a connection beetween two points in real time,
> so that I can play video or play music in remote machines. The
> connection is a point to point connection, is not a connection beetween
> two hosts in the same ethernet. I am using PC linux with many network
> cards as a router. Many thanks in advance.
> 
> Vicente
> [EMAIL PROTECTED]
> 
> 
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