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Re: [v6ops] SLAAC security concerns

Mark Smith <markzzzsmith@gmail.com> Tue, 04 August 2020 23:33 UTC

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References: <f52c4463862f44b5ba2a9d41db86d231@huawei.com> <20200804194448.GA2485@Space.Net>
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From: Mark Smith <markzzzsmith@gmail.com>
Date: Wed, 05 Aug 2020 09:32:56 +1000
Message-ID: <CAO42Z2x_AE=W2gQd4t3nZPVvGCxT3u0L0BCGJPZ0RFo+2m8Xbg@mail.gmail.com>
To: Gert Doering <gert@space.net>
Cc: Vasilenko Eduard <vasilenko.eduard@huawei.com>, Michael Richardson <mcr+ietf@sandelman.ca>, 6man <ipv6@ietf.org>, v6ops list <v6ops@ietf.org>
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Subject: Re: [v6ops] SLAAC security concerns
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On Wed, 5 Aug 2020, 05:44 Gert Doering, <gert@space.net> wrote:

> Hi,
>
> On Tue, Aug 04, 2020 at 06:00:39PM +0000, Vasilenko Eduard wrote:
> > I believe that Multicast is so basic function of SLAAC that it does not
> make sense to delete it.
>
> Have I heard "delete multicast" here?
>
> Yes, please!
>
> There is too many broken switch vendors out there that show again and
> again that "implementing multicast is hard", breaking IPv6 ND in the
> process.
>
> The motivation for going to multicast "back in the dark ages" might have
> been honorable, but in today's networks, it just adds needless
> complications.
>

Multicast also shifts and distributes state away from a central device.

A central device is a much bigger consequence point of failure, and is a
harder thing to make redundant due to having to invent a state
synchronisation and load selection or distribution method mechanism between
a primary and one or more backup nodes.

Nodes maintaining their own state is simpler and means that when a node
fails, the loss of state due to the failure only impacts the failed node.

A specific design for redundant DHCPv6 has to exist. Redundancy in SLAAC
came inherently in its design because a node failure only impacts that node.



> Gert Doering
>         -- NetMaster
> --
> have you enabled IPv6 on something today...?
>
> SpaceNet AG                      Vorstand: Sebastian v. Bomhard, Michael
> Emmer
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