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Re: Extending a /64

Brian E Carpenter <brian.e.carpenter@gmail.com> Sun, 15 November 2020 22:43 UTC

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Subject: Re: Extending a /64
To: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>, ipv6@ietf.org
Cc: Michael Richardson <mcr+ietf@sandelman.ca>
References: <202011151920.0AFJKN9U003337@mail2.mwassocs.co.uk> <3d26bffe-b6c9-4ed7-6135-a515f9902fd7@gmail.com> <m1keOTi-0000EGC@stereo.hq.phicoh.net> <CAO42Z2wZkXryhw1u5WAFdtCvXHyyz1zeM22FP_gRxjurjsG-Jw@mail.gmail.com> <29299.1605477799@localhost> <m1keQWu-0000LoC@stereo.hq.phicoh.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <bf703645-6d9d-9592-61b1-ff4d00d43aa4@gmail.com>
Date: Mon, 16 Nov 2020 11:43:36 +1300
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On 16-Nov-20 11:29, Philip Homburg wrote:
>> Remember that it might be 2^19 concurrent airplanes, but the address plan
>> would be expected to last a hundred years or so.
> 
> Assuming 16 billion people in the year 2100, then a 39 bit number for planes
> has space for 34 planes for each person alive.
> 
> Maybe that is overdoing it a bit. Or if we have that number of planes, maybe
> a single prefix is a bit silly.

It's more than that. It's just wrong and doesn't match how Internet WAN routing works.

We might as well admit that 3GPP/5G gets worldwide mobile connectivity right and the Internet doesn't.

We should also remember that experience has taught us that embedding unique IDs in addresses is a very bad idea, even in the Interface Identifier, let alone in the routing prefix. Those 19 bits have no business in a prefix, ever.

   Brian

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