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Re: [v6ops] privacy point re. unsolicited NA / router neighbor cache

Gert Doering <gert@space.net> Tue, 23 July 2019 07:01 UTC

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Date: Tue, 23 Jul 2019 09:01:41 +0200
From: Gert Doering <gert@space.net>
To: David Lamparter <equinox@diac24.net>
Cc: Mark Smith <markzzzsmith@gmail.com>, v6ops list <v6ops@ietf.org>
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Subject: Re: [v6ops] privacy point re. unsolicited NA / router neighbor cache
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Hi,

On Tue, Jul 23, 2019 at 02:00:49AM +0200, David Lamparter wrote:
> => Yes: it seems someone configured multicast.  (You don't get this
>    without config, it's a bit of a PITA honestly.)  Proceed to 2.
> 
> 2. is whoever configured multicast competent?

The general assumption for on-link multicast should be "it's broadcast
or it is getting lost".

Switch vendor track record shows that this is a constantly recurring
problem, and the *best* you can hope for operational robustness is
"on-link multicast is handled like broadcast".  All the other snooping
things just cause more work in figuring out this week's bugs and how
to turn off the snopping bits.

The general idea that on-link multicast is a positive aspect of IPv6 
is nice, but wrong.

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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