--On Friday, February 10, 2012 11:22 -0700 Chris Grundemann <cgrundemann@xxxxxxxxx> wrote: > On Fri, Feb 10, 2012 at 11:15, John C Klensin > <john-ietf@xxxxxxx> wrote: > >> To follow up on an earlier comment, the rate at which ARIN (or >> other RIRs) are running out of /10s (or /8s) is probably >> irrelevant, as are hypotheses about what ARIN staff might do >> about requests for allocation for CGN use with or without this >> policy/ block. >... > This is not about IPv4 life-support. This is about providing > the best answer to a difficult problem. Run-out date is not > nearly as important as efficient use at this point. It is not > efficient for multiple ISPs to use different space when a > shared space will function optimally. Indeed, although I note that it isn't a huge step from the above to get to "we could really make _much_ more efficient use of IPv4 space by partitioning the Internet into regions and using explicit routing or X.75-like gateways to route traffic between regions, thereby permitting each region to use almost all of the IPv4 space". One could even use CGNs to establish that model with each ISP using almost the entire IPv4 space inside its castle walls. Now, I think either of those would be terrible ideas but, as you and others are probably aware, people who believe themselves to be serious and competent have proposed them, almost exactly Anything that moves us closer to those models gives me visions of slippery steep cliffs and the creeps, so I feel a need to be careful about efficiency arguments too. YMMD, either because you see the efficiency arguments differently, because you have reason to be less afraid of an ultimate "islands connected by gateways" outcome, or for other reasons. >> If that difference is less than years, I, personally, don't >> think that particular argument is useful. Other arguments >> may be, but not that one. > > Please see > https://tools.ietf.org/html/draft-bdgks-arin-shared-transition > -space for a more thorough analysis of the motivations, pros, > cons, and alternatives for this shared CGN space. I think > you'll find that those other arguments are laid out there. I have and I agree those arguments are there (their interaction with my fear of the scenarios above is another matter). Again, my main suggestion was that we just stop the discussions based on allocation strategies or IPv4 exhaustion alone... because they are distractions rather than helpful. john _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf