Re: [v6ops] Iotdir telechat review of draft-ietf-v6ops-slaac-renum-04

Fernando Gont <fgont@si6networks.com> Tue, 20 October 2020 20:00 UTC

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To: Ted Lemon <mellon@fugue.com>, iot-directorate@ietf.org
Cc: draft-ietf-v6ops-slaac-renum.all@ietf.org, v6ops@ietf.org, last-call@ietf.org
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From: Fernando Gont <fgont@si6networks.com>
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Date: Tue, 20 Oct 2020 16:51:39 -0300
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Subject: Re: [v6ops] Iotdir telechat review of draft-ietf-v6ops-slaac-renum-04
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Hello, Ted,

Thanks a lot for your comments (past and present ;-) )! In-line....


On 19/10/20 13:21, Ted Lemon via Datatracker wrote:
> Reviewer: Ted Lemon Review result: Ready with Nits
> 
> This draft does a good job of discussing typical home use scenarios, 
> where the problems described in the document are most likely to 
> occur. It might be worth noting that some of the assumptions about 
> prefix stability may not be applicable to commercial IoT
> deployments.

Could you please elaborate a bit more?


> This is relevant because some IoT deployments make use of sleepy 
> devices that may only wake up once per day or even less frequently. 
> The suggested parameters would be inappropriate for such a device.

Just me double-checking: Do you mean it would be to short for them?

Please note that the default router lifetime is 1800 seconds. So a host
that sleeps for longer than that will presumably not have a default 
router when it wakes up, and would need to do a "refresh" procedure 
(RS/RA exchange) before it would be able to send a packet, anyway.



> At the same time such a device likely is not relying on RA, since it
>  would not be awake for periodic refreshes. Nevertheless the 
> operational mitigations section could use some additional verbiage 
> about applicability so that readers do not assume that the advice 
> given there is universally applicable.

Please clarify the above, and based on that, we could craft some text if
necessary.

Thanks!

Cheers,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492