And something in the message stream tried to convert my elegantly computed result into a phone number. Sigh.
-mel > On Dec 20, 2017, at 1:39 PM, Mel Beckman <m...@beckman.org> wrote: > > [This sender failed our fraud detection checks and may not be who they appear > to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing] > > Bill, > > You are correct. > > As a double check, I divided 340282366920938463463374607431768211456 by > 4294967296, getting > 79228162514264<tel:79%20228%20162%20514%20264>337593543950336<tel:337%20593%20543%20950%20336>, > which is 28.8 orders of magnitude :) > > -mel > > On Dec 20, 2017, at 12:58 PM, William Herrin > <b...@herrin.us<mailto:b...@herrin.us>> wrote: > > On Wed, Dec 20, 2017 at 1:48 PM, Mel Beckman > <m...@beckman.org<mailto:m...@beckman.org>> wrote: > I won’t do the math for you, but you’re circumcising the mosquito here. We > didn’t just increase our usable space by 2 orders of magnitude. It’s > increased more than 35 orders of magnitude. > > Hi Mel, > > The gain is just shy of 29 orders of magnitude. 2^128 / 2^32 = 7.9*10^28. > > There are 2^128 = 3.4*10^38 IPv6 addresses, but that isn't 38 "orders of > magnitude." Orders of magnitude describes a difference between one thing and > another, in this case the IPv4 and IPv6 address spaces. > > > Using a /64 for P2P links is no problem, really. Worrying about that is like > a scuba diver worrying about how many air molecules are surrounding the boat > on the way out to sea. > > It's not a problem, exactly, but it cuts the gain vs. IPv4 from ~29 orders of > magnitude to just 9 orders of magnitude. Your link which needed at most 2 > bits of IPv4 address space now consumes 64 bits of IPv6 address space. > > Then we do /48s from which the /64s are assigned and we lose another 3 or so > orders of magnitude... Sparsely allocate those /48s for another order of > magnitude. From sparsely allocated ISP blocks for another order of magnitude. > It slips away faster than you might think. > > Regards, > Bill Herrin > > > -- > William Herrin ................ > her...@dirtside.com<mailto:her...@dirtside.com> > b...@herrin.us<mailto:b...@herrin.us> > Dirtside Systems ......... Web: <http://www.dirtside.com/>