[HECnet] GRE

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