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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 17:31 UTC

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To: otroan@employees.org, Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Cc: 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 06:31:43 +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 04:27, otroan@employees.org wrote:
>>> Take the simple case of a laptop with VMs. It has to handle the
>>> smallest common denominator. As long as networks treat everything
>>> that connects to it as hosts. Then either the host with VMs (aka
>>> router) has to pretend to be a host and do one of bridging or NAT. Or
>>> with this proposal it can subnet the /64.
>>
>> I am not sure I understand, but it is hard to subnet a /64 further to interfaces that want their IIDs to be 64.  Or you want these interfaces to not run SLAAC?  Do you have other means to automatically configure their addresses?
> 
> I just enumerated the choices an operator / implementor have in this case.

Yes, but only if /64 is no longer sacred. It's going to be tricky if some
of the nodes on the /66 subnets assume SLAAC at /64.

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.

   Brian

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