This may be useful as well, somehow related, as using /64 has a clear advantage: https://datatracker.ietf.org/doc/draft-palet-v6ops-p2p-from-customer-prefix/ Regards, Jordi -----Mensaje original----- De: NANOG <nanog-bounces@nanog.org> en nombre de JORDI PALET MARTINEZ <jordi.palet@consulintel.es> Responder a: <jordi.palet@consulintel.es> Fecha: miércoles, 20 de diciembre de 2017, 20:26 Para: <nanog@nanog.org> Asunto: Re: Waste will kill ipv6 too This may be helpful: https://www.ripe.net/publications/docs/ripe-690/ Regards, Jordi -----Mensaje original----- De: NANOG <nanog-bounces@nanog.org> en nombre de Mike <mike-nanog@tiedyenetworks.com> Responder a: <mike-nanog@tiedyenetworks.com> Fecha: miércoles, 20 de diciembre de 2017, 19:26 Para: <nanog@nanog.org> Asunto: Waste will kill ipv6 too On 12/17/2017 08:31 PM, Eric Kuhnke wrote: > some fun examples of the size of ipv6: > > https://samsclass.info/ipv6/exhaustion-2016.htm > > https://www.reddit.com/r/theydidthemath/comments/2qxgxw/self_just_how_big_is... > Every time I see these "Look how many more addresses we have now with IPv6", I just shake my head. Yes, the address space is very large. But, all of the protocols, all of the addressing guides, all of the operational 'best practices', ALL OF IT, increases by orders of magnitude the amount of waste along with it. Call this the 'shavings', in IPv4 for example, when you assign a P2P link with a /30, you are using 2 and wasting 2 addresses. But in IPv6, due to ping-pong and just so many technical manuals and other advices, you are told to "just use a /64' for your point to points. So, the actual waste is dilutes the actual implementable size of the total ipv6 address space due to the waste component. And I have not yet seen any study or even proposed theory to explore what the IPv6 Internet would look like, if used in place of all IPv4 in all the places and ways that it's used. I think, in time, we will discover that we have only increased our usable ip space by no more than 2 orders of magnitude over that which is achieved in ipv4, and we will be looking again at a global ip protocol upgrade I bet within my lifetime. While we are at it, why is nobody thinking or talking about the looming exhaustion of ieee OUI addresses? Network cards made 15 years ago and since consigned to the electronics scrap heap in the sky, take with them their addresses never to be reused again (unless you are a freak like me and keep some for 'positively never assigned anywhere'). And old dead companies that were assigned OUIs, they get 24 bits of address space to take to their graves. We should be re-thinking mac addressing altogether too. (Please no hate mail, these opinions are strictly mine...) 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