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

Mark Smith <markzzzsmith@gmail.com> Mon, 13 November 2017 07:52 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Mon, 13 Nov 2017 18:52:21 +1100
Message-ID: <CAO42Z2xacRco7ne7biQ93so0k-x4xSnM2jzoB13-sdVRLshQDQ@mail.gmail.com>
Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
Cc: Erik Nordmark <nordmark@acm.org>, Ole Troan <otroan@employees.org>, Fernando Gont <fgont@si6networks.com>, "v6ops@ietf.org WG" <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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On 13 Nov. 2017 14:08, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <
gunter.van_de_velde@nokia.com>; wrote:

The session state management procedures out of scope of this document. This
is scope creep.


I don't think it is.

It's a fantasy that routers don't fail, or that a single router on a link
is always enough.

Host connections are supposed to survive transient failures such router
reloads or switching to a different router that provides equivalent packet
forwarding service. If a host loses its prefix in this scenario because of
either of those events, then I don't think this method as currently
described is robust against a foreseeable failure.

I don't think it is a Best current practice if router redundancy hasn't
been considered or tested and deployed, and can therefore be documented. I
see value in the approach because of SLAAC compatibility with hosts however
I think it is currently half baked.

Regards,
Mark.


G/

-----Original Message-----
From: v6ops [mailto:v6ops-bounces@ietf.org] On Behalf Of Erik Nordmark
Sent: Monday, November 13, 2017 11:05
To: Ole Troan <otroan@employees.org>;; Fernando Gont <fgont@si6networks.com>;
Cc: v6ops@ietf.org WG <v6ops@ietf.org>;; 6man@ietf.org
Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-
prefix-per-host)

On 11/13/2017 10:42 AM, Ole Troan wrote:

> Or do as I do in my implementation.
> Model each host as being on it's own point to point interface.
> Configure the IPv6 prefix on that interface. That configured state is
exactly like what we have in classic SLAAC.

Ole,

did you figure out how to expire those allocated prefixes when the host is
long gone from the network?

The draft seems to be silent on that issue and if the purpose is to
document some current practice it would be good to capture that.

    Erik

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