Re: [v6ops] Implementation Status of PREF64

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 12 October 2021 08:12 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>, Ted Lemon <mellon@fugue.com>
CC: v6ops list <v6ops@ietf.org>
Thread-Topic: [v6ops] Implementation Status of PREF64
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Date: Tue, 12 Oct 2021 08:12:22 +0000
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Subject: Re: [v6ops] Implementation Status of PREF64
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When that’s the case, and the node needs, say, less than 1000 addresses, could we delegate a /118?
This way, we can build a /64 NBMA subnet, which maintains the subnet boundary at /64, but allow routing inside.
We could, e.g., terminate vxlan on the /118 and use routing over them.
I would love to see that…

Pascal

From: v6ops <v6ops-bounces@ietf.org> On Behalf Of Lorenzo Colitti
Sent: mardi 12 octobre 2021 6:39
To: Ted Lemon <mellon@fugue.com>
Cc: v6ops list <v6ops@ietf.org>
Subject: Re: [v6ops] Implementation Status of PREF64

On Tue, Oct 12, 2021 at 1:14 AM Ted Lemon <mellon@fugue.com<mailto:mellon@fugue.com>> wrote:
However, they’re not going to want IA_PD addresses on the directly attached interface. They’re going to want IA_NA there and to route the IA_PD prefix to the host via ND resolution of the MAC of it’s IA_NA address.

This isn't really necessary, although it's common practice. If the device is not going to use the prefix on the DHCP-ward link, it can use the address on the link it /does/ use the prefix on as its GUA. Its link-local address on the DHCP-ward link will suffice for routing, and is known to the DHCP server because that's the address it used to do the IA_PD.

+1, that's how I think such an implementation would behave.