[HECnet] GRE

[Dave McGuire]

On 03/19/2012 06:07 PM, Johnny Billquist wrote:
Ah, and rereading the stuff right now reminds me of why I never got
anywhere with it. I can't seem to understand how you use it for non-IP
traffic.
Even reading the Wikipedia article, it says:

"A GRE tunnel is used when IP packets need to be sent from one network
to another, without being parsed or treated like IP packets by any
intervening routers."

So, it is essentially for IP traffic. It don't seem to be generic enough
for any random ethernet traffic.
Then, of course, you can run any kind of traffic on top of that IP layer
in the GRE tunnel, and it will all be invisible to the outside. But that
don't help when there is no IP to start with...

  No, GRE isn't just for IP.   You can bridge most any protocol with GRE.   I've bridged non-IP-based Windows networks (for a customer) many years ago using GRE over a WAN.   The Wikipedia article is poorly worded.

I'll happily go on talking with people interested in this more, but we
might do it outside of this list, since it will quickly become pretty
narrow and technical.

  Ok.

                    -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA