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Re: Extending a /64

"Templin (US), Fred L" <Fred.L.Templin@boeing.com> Mon, 16 November 2020 15:34 UTC

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From: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>
To: "ipv6@ietf.org" <ipv6@ietf.org>
Subject: Re: Extending a /64
Thread-Topic: Extending a /64
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Date: Mon, 16 Nov 2020 15:33:50 +0000
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On the comment of "race to the bottom", AERO/OMNI (which have been matured
under the ICAO activities Tony and Saulo are referring to) takes the philosophy of
RFC6177 for assignment of IPv6 prefixes to aircraft as "sites". We would prefer /56
or shorter, but per Tony's message there is currently a leaning toward /60.

However, the AERO/OMNI mechanisms are capable of extending to prefix lengths
up to /112. That would give a 112-bit "network part" and a 16-bit "host part", which
seems like just enough individual addresses for even the smallest of networks.

So, why are we thinking of "race to the bottom" in terms of the /128 extreme?
What if we defined "the bottom" to be /112?

Fred

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