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Re: [v6ops] address representations, and addresses without IIDs

Gert Doering <gert@space.net> Wed, 24 March 2021 14:49 UTC

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Date: Wed, 24 Mar 2021 15:49:24 +0100
From: Gert Doering <gert@space.net>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Cc: Gert Doering <gert@space.net>, Gabor LENCSE <lencse@hit.bme.hu>, v6ops@ietf.org
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Subject: Re: [v6ops] address representations, and addresses without IIDs
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Hi,

On Wed, Mar 24, 2021 at 03:44:29PM +0100, Alexandre Petrescu wrote:
> I have a big problem in talking about addresses that start with 000 
> binary because there are so many ways to express these addresses in an 
> IPv6 literal format.  Also the 1000::/3 start with 000, also 1FFF::/3 
> start with 000, also 64::/96 start with 000.

There is an RFC that clearly states how addresses SHOULD be written,
and with a bit of experience, it is also clear that 0000 ... 01FF is
"FP 000", while 2000: to 3fff: is "FP 001" (which is currently the only
one governed by the RIR system).

> Because of that problem of talking about addresses, and because of the 
> 000 exception, it is difficult to talk about IPv6 64bit boundaries.

Uh... no?

[..]
> > And it has no IID at all, not "/32".
> 
> An address with no IID at all?
> 
> Bon, ok...

Generally speaking, NAT64 is a packet translation rule.  So it has no
"interface" at all.  Even if it has one, because that's easier for
implementations to configure and present, it won't have an IID, because
the translator does not need an address in the /96.

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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