On Thu, May 26, 2016 at 11:35 AM, Templin, Fred L <[email protected]> wrote: > Hi Joe and Tom, > >> -----Original Message----- >> From: Joe Touch [mailto:[email protected]] >> Sent: Thursday, May 26, 2016 11:26 AM >> To: Tom Herbert <[email protected]> >> Cc: Templin, Fred L <[email protected]>; [email protected] >> Subject: Re: [Int-area] Call for adoption of draft-xu-intarea-ip-in-udp-03 >> >> >> >> On 5/26/2016 11:22 AM, Tom Herbert wrote: >> > On Thu, May 26, 2016 at 10:56 AM, Joe Touch <[email protected]> wrote: >> >> >> >> On 5/26/2016 10:52 AM, Tom Herbert wrote: >> >>> On Thu, May 26, 2016 at 10:41 AM, Joe Touch <[email protected]> wrote: >> >>>> Here's the problem: >> >>>> >> >>>> The first 4 bits are either part of the GUE header or IPv4 or IPv6. >> >>>> >> >>>> In the diagrams in draft-ietf-nvo3-gue and RFC791 they're indicated in >> >>>> the >> >>>> following bit order: 0,1,2,3 >> >>>> >> >>>> In GUE, these are 0,0,x,x >> >>>> >> >>>> In IPv4, these are 0,0,1,0 >> >>>> >> >>>> In IPv6, these are 0,1,1,0 >> >>>> >> >>> IPv4 is 0,1,0,0. >> >> Not LSB to MSB, which is how both GUE and RFC791 define the header: >> >> >> > >From RFC791: >> > >> > "Whenever an octet represents a numeric quantity the left most bit in >> > the diagram is the high order or most significant bit. That is, the >> > bit >> > labeled 0 is the most significant bit." >> Arrgh. >> >> Yup. OK, so the reason this would work is only because we no longer use >> IP versions 0..3. >> >> Got it. > > I for one like it, and I am using it in my AERO implementation. As Joe points > out > however it does not account for fragmentation, identification etc. But, as > long > as you use it in a carefully controlled environment it should be OK. > > Can we have this added back to the GUE spec? > Since it technically defines a new version of GUE and other than the two bit version number there is nothing else in common with GUEv0 format, I would say this should be a new spec (I need to go back and see if I wrote it up this in a draft).
Fred, do you have any objective data showing the benefits? I think we need something tangible to justify complexity (i.e. burning 25% of the GUE version number space ;-) ) Thanks, Tom > Thanks - Fred > >> >> Joe > _______________________________________________ Int-area mailing list [email protected] https://www.ietf.org/mailman/listinfo/int-area
