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RE: [EXTERNAL] Re: Extending a /64 (ATN/IPS worked example)

"Manfredi (US), Albert E" <albert.e.manfredi@boeing.com> Tue, 17 November 2020 22:30 UTC

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From: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
To: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: RE: [EXTERNAL] Re: Extending a /64 (ATN/IPS worked example)
Thread-Topic: [EXTERNAL] Re: Extending a /64 (ATN/IPS worked example)
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Date: Tue, 17 Nov 2020 22:30:35 +0000
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-----Original Message-----
From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Templin (US), Fred L

> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>>
>> I can see the value of having it in the address, assuming you have some kind of authentication of the address. Why does it specifically need to be in the prefix?
>
> It needs to be in the upper 60 bits, because the lower 68 bits are used for on-board
subnetting and assigning interface identifiers to on-board network nodes.

IMO, it's always going to be difficult to assume so many changes to existing practice and existing conventions, all at once.

Doing this is a more conventional way, you could request a /48 or a /56 (at least) for each airplane, as their home address. That prefix could belong to the country home base of the airline, for example, exactly as one would expect. Without taking away prefix bits to identify an airplane.

Use the 16 or 8 bits for on board subnetting. Use up, say, 24 or 39 bits of the IID in each subnet for whatever airplane identifier. Now you have only one fight on your hands: an IID that is not purely random.

I'm with Brian. The natural location of non-topological bits is in the IID. No surprise, as they were originally thought to incorporate the MAC address. Which is non-topological, and incorporates 24 bits of OUI.

Bert

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