Re: Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 09 November 2017 03:53 UTC

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Subject: Re: Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
To: ipv6@ietf.org
References: <be9724f5-2ff5-d90c-2749-ecae2c628b78@si6networks.com> <CAAedzxpLL26kDi1yzB=rDQjuNOpb64wtCBMcP+VYf=dc54rF7w@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Thu, 9 Nov 2017 16:53:23 +1300
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On 09/11/2017 16:02, Erik Kline wrote:
> I don't think we should be recommending unique RAs per device where
> the devices are all on a shared link.

Why not? Where's the harm? As pointed out at
https://tools.ietf.org/html/draft-ietf-v6ops-unique-ipv6-prefix-per-host-13#page-5
it's permissible under RFC 4861. This is not an innovation.
 
> My understanding was that in the original motivating wifi deployment
> every node is effectively isolated in its own (pseudo)VLAN, and
> node-to-node traffic must be routed through the infrastructure (to the
> extent such a thing can actually be enforced in a medium like wifi).

It can also be enforced on a switched LAN if the switch does the requisite
peeking. We may not be happy at such layer violations, but it seems
to me that the days of true broadcast LANs are numbered and a lot of
these things will need to be rethought in the coming years.

Just a reminder, this draft was approved by the IESG a while ago
and is in state "RFC Ed Queue : AUTH48 for 23 days". This unique
unicast has been in there for a long time, although the phrasing
was clarified in the last couple of months, which is what WG
and IETF Last Calls are for.

   Brian