Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 29 July 2015 07:12 UTC

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Date: Wed, 29 Jul 2015 19:12:26 +1200
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Tore Anderson <tore@fud.no>, Ted Lemon <ted.lemon@nominum.com>
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Subject: Re: [v6ops] I-D Action: draft-colitti-v6ops-host-addr-availability-01.txt
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On 29/07/2015 17:44, Tore Anderson wrote:
> * Ted Lemon
> 
>> On Jul 28, 2015, at 2:36 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>>> Not to mention encountering the problems with /120 mentioned
>>> in RFC 7421, which include the problems of only having a /24 in
>>> IPv4. We should be past that.
>>
>> To be clear, I wasn’t proposing /120 prefixes, but the delegation
>> of /120 prefixes as a way of delivering a chunk of contiguous
>> addresses smaller than a /64, which I continue to think is
>> impractical for Lorenzo’s use case.

<snip>

> That said, given that the draft is targeted at operators, I think it
> would benefit from unequivocally stating that the use of prefixes (both
> delegated and link) with lengths >/64 are considered invalid and any
> solution involving them is therefore not being discussed - because when
> I read the draft while wearing my operator hat only, I see that as a
> solution that would actually work just fine from a technical point of
> view. RFC 7421 section 4.3.2 appears to confirm I am not alone in this,
> stating «DHCPv6 is in widespread use without any dependency on the /64
> boundary».

I think we should also note that once we start delegating long prefixes
out of a /64, the privacy properties of a "normal" IPv6 address are
blown away. In fact the draft probably needs a Privacy Considerations
section - presumably it's the /64 that would be of interest for
geolocation, the NSA, RIPA, etc.

    Brian