Okay, we are synced. Dino
> On Feb 28, 2022, at 10:35 PM, Joe Touch <to...@strayalpha.com> wrote: > > In the example I gave, I was equating GRE *to* UDP, not saying it ran over > UDP, though it can (port 4754, per RFC 8086). > > Joe > >> On Feb 28, 2022, at 10:15 PM, Dino Farinacci <farina...@gmail.com> wrote: >> >> There is no UDP port number assigned for GRE because it does not run over >> UDP. It runs DIRECTLY over IP. Check the RFC if you don’t believe me. >> >> Dino >> >>> On Feb 28, 2022, at 9:29 PM, to...@strayalpha.com wrote: >>> >>> >>>>>> On Feb 28, 2022, at 8:00 PM, Dino Farinacci <farina...@gmail.com> wrote: >>>>>> >>>>>> There is a base case to the recursion, i.e., where logical information >>>>>> meets fermions and bosons (literally). But that tells you only that base >>>>>> layer; it tells you nothing about the meaning of the headers you see >>>>>> inside, e.g., in OSI, they would be 1,2,3,4,5,6,7, but in an IP tunnel, >>>>>> they could be 1,2,3,3,4,5,6,7, with GRE they could be 1,2,3,2,3,4,5,6,7, >>>>>> etc. >>>> >>>> An IP tunnel with protocol number 4 is indeed 1,2,3,3,4,5,6,7, but LISP >>>> (UDP port 4341) UDP tunnels are 1,2,3,4,3,4,5,6,7 and GRE is >>>> 1,2,3,3,4,5,6,7 because it runs directly over IP with protocol number 47. >>>> >>>> Dino >>> >>> If GRE runs over IP, then it would be the same as IP-over-UDP tunnels: >>> >>> 1,2,3(IP), 4(GRE, since it is a protocol number of IP), 3(IP in GRE), >>> 5,6,7, i.e.: 1,2,3,4,3,4,5,6,7 >>> >>> It’s all actually relative, though - to the left IP, GRE is layer 4. To the >>> right IP, GRE is layer 2. >>> >>> Joe > _______________________________________________ Int-area mailing list Int-area@ietf.org https://www.ietf.org/mailman/listinfo/int-area
