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Re: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 16 March 2017 22:43 UTC

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To: Gert Doering <gert@space.net>
References: <c8c0f5be-28bb-ba31-16da-7fc7e3fccec0@gmail.com> <20170316082639.GF2367@Space.Net> <29F9E911-E637-456D-A930-3316FFD93C41@jisc.ac.uk> <27AE6A05-C742-44BF-98E8-BFCEC72316F2@employees.org> <EF0F4950-F238-4001-BA74-D9440524BEFA@gmail.com> <634a6a12-4d82-da33-6d1d-baae2e5b2891@gmail.com> <13DA8077-91C1-4B3F-9D67-3727F546D202@employees.org> <13194a4f-aeda-63b0-0293-6bc738b068f2@gmail.com> <4D60B43B-24F9-4701-800E-13CF32CD4769@employees.org> <8fc7f3e7-7155-f184-c028-a9f6da7e97db@gmail.com> <20170316201413.GQ2367@Space.Net>
Cc: otroan@employees.org, Alexandre Petrescu <alexandre.petrescu@gmail.com>, v6ops@ietf.org
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 17 Mar 2017 11:43:47 +1300
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Subject: Re: [v6ops] WGLC: draft-ietf-v6ops-unique-ipv6-prefix-per-host-02 - multiple prefixes per device
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On 17/03/2017 09:14, Gert Doering wrote:
> Hi,
> 
> On Fri, Mar 17, 2017 at 06:31:43AM +1300, Brian E Carpenter wrote:
>> So, it seems clear to me that while getting a /64 is better than getting
>> a /128, it's even better to get a /56. Or even one of those 15 trillion /48s.
>> We should make it clear that /64 is not even second-best. Just better
>> than /128.
> 
> "give any *host* that connects a /48" (and dimension pools on WiFi
> hotspots etc. big enough to actually be able to do this) might actually 
> be a good way to ensure IPv6 is going to run out faster than expected...
> 
> IOW, be careful with the maths here.

Yes, one always needs cautious allocation policies. But still... /64
is not enough in the general case, with today's link-layer media
and today's IPv6 stacks. (We can have the argument about tomorrow
some other time. :-)

   Brian

    Brian

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