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Re: Extending a /64

Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com> Fri, 20 November 2020 10:20 UTC

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To: ipv6@ietf.org
Subject: Re: Extending a /64
From: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
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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> <5f505585-1328-d942-2ec2-a2d96b7b4779@foobar.org> <CAO42Z2yk5pEKGFEYk3MDDDybVDZt6GiE1Pw932n4gLaqSxGH7A@mail.gmail.com> <23487.1605731956@localhost> <CAO42Z2yesLcdRw0HrNBsUAm-x=T9OneCjPMLmq8oZ4_ZH99Tsw@mail.gmail.com> <8f6bab4b-4171-66ba-cff4-742adc10ceea@foobar.org> <01cd5a82-be72-54b8-0171-3720f25cae0d@mccallumwhyman.com> <CAO42Z2xYAut_dfQtGrwkm7VWw9NPhsa5xaE9NqjCaK9L8RoMQA@mail.gmail.com> <7c500d2b-bc44-d00e-9cc2-96046c6ec5d6@foobar.org> <CAO42Z2wgWeHDpShz3zn4WH4aRvNHoGjntENMpiy9JqTAJQe-gg@mail.gmail.com>
In-reply-to: Your message of "Fri, 20 Nov 2020 13:49:27 +1100 ." <CAO42Z2wgWeHDpShz3zn4WH4aRvNHoGjntENMpiy9JqTAJQe-gg@mail.gmail.com>
Date: Fri, 20 Nov 2020 11:19:51 +0100
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>ULAs are specifically designed to allow interconnecting to other ULA
>networks without resorting to renumbering or IPv6 NAT.
>
>That is why the Global ID is required to pseudo-random, so that when two
>ULA networks are interconnected, there is no overlapping or duplicate
>address space. Subnet prefixes and therefore the hosts attached to them
>already have globally unique addresses, even though they don't have global
>reachability or access.

If a separate ULA /48 is allocated for echt aircraft then that may
significantly increases the collision risk. If all aircraft are numbered
from a single /16 taken from ULA, then the risk of collisions is very high.

For ULA to work you need to have only a few /48s that connect.

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