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Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 16 August 2017 20:21 UTC

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To: Simon Hobson <linux@thehobsons.co.uk>, v6ops list <v6ops@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Thu, 17 Aug 2017 08:21:22 +1200
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt
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On 17/08/2017 07:47, Simon Hobson wrote:
> Lorenzo Colitti <lorenzo@google.com> wrote:
> 
> 
>> /64 gives you something that no longer prefix does: the ability to run SLAAC and connect unlimited devices behind the host. 
> 
>>From previous discussions, I am led to believe that SLAAC will work with other (longer or shorter) prefixes. It is only the deprecated EUI64 method that *needs* 64 bits.

Properly coded SLAAC will work with any reasonable length, but standards-compliant
IPv6-over-foo drivers will *all* inform SLAAC that the length is 64, because that is
the parameter set by the addressing architecture.

What we are discussing here is not SLAAC, or the fact that each driver has to inform
SLAAC about the IID length, but whether the addressing architecture should continue
to define a universal constant for that parameter.

And we are certainly not discussing whether IPv6 supports variable length subnet masks.

   Brian

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