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Re: [v6ops] Fwd: New Version Notification for draft-linkova-v6ops-ipmaclimi-00.txt

Lorenzo Colitti <lorenzo@google.com> Wed, 09 November 2022 13:59 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 09 Nov 2022 13:59:31 +0000
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To: Jen Linkova <furry13@gmail.com>
Cc: Ole Troan <otroan@employees.org>, V6 Ops List <v6ops@ietf.org>
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Subject: Re: [v6ops] Fwd: New Version Notification for draft-linkova-v6ops-ipmaclimi-00.txt
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On Wed, Nov 9, 2022 at 1:10 AM Jen Linkova <furry13@gmail.com> wrote:

>
> > With SLAAC we don’t have a mechanism for the host to request that it
> needs addresses, nor do we have a mechanism to signal from the network that
> it doesn’t get it.
>
> OK, let's imagine we have a protocol X to do this.
> Now my ChromeOS device requests X addresses for all namespaces.
> The network is saying: "Sorry, can't do this, only X-1 addresses are
> available".
> The only options I see are:
> - a given application/namespace fails, causing a user-visible outage.
> - NAT66.
>

That's the fundamental issue here. In SLAAC, With SLAAC, this doesn't work
and the host doesn't know that it didn't work. With DHCPv6 or SLAAC+ARO,
the host *knows* it didn't work, but *it still didn't work*. So let's not
turn this into a SLAAC vs DHCP discussion. Changing address assignment
protocols will not prevent the failure, it will only change the failure
mode.

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