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Re: IID length text

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 23 January 2017 19:33 UTC

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Subject: Re: IID length text
To: ipv6@ietf.org
References: <20170123124954.13329c33@echo.ms.redpill-linpro.com> <CAKD1Yr2jFf=OFiCJLWV48FRZF1iuWK1mLJ9+kQiuFBxujgCOBQ@mail.gmail.com> <20170123150743.6960611b@envy.e1.y.home> <20170123.163609.74661096.sthaug@nethelp.no>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 24 Jan 2017 08:33:37 +1300
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On 24/01/2017 04:36, sthaug@nethelp.no wrote:
>>> the interface ID isn't really an ID any more.
>>
>> I suppose you can look at it that way too...but wouldn't that then mean
>> that you're essentially saying that you can have whatever amount of
>> suffix/node/host bits in an IPv6 address you'd like, but you're only
>> allowed to call it an «IID» if it just so happens to be exactly 64 of
>> them? :-)
> 
> Isn't that how IPv6 is sometimes used in the real world? E.g. transit
> providers who insist on a non-64 bit mask on the transit links.
> 
> Anybody who believes that only /64 (and /127) is in use on interfaces
> in the real world is seriously deluded.

Indeed. But I think the point has been hammered home and I expect that
the draft will be wordsmithed accordingly before we see a new version.

   Brian

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