Re: [Ntp] Mirja Kühlewind's Discuss on draft-ietf-ntp-using-nts-for-ntp-24: (with DISCUSS and COMMENT)

Marcus Dansarie <marcus@dansarie.se> Tue, 24 March 2020 17:20 UTC

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Sender: Marcus Dansarie <marcus.dansarie.nilsson@gmail.com>
To: Mirja Kuehlewind <ietf@kuehlewind.net>
Cc: Ragnar Sundblad <ragge@netnod.se>, ntp@ietf.org, The IESG <iesg@ietf.org>
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From: Marcus Dansarie <marcus@dansarie.se>
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Subject: Re: [Ntp] Mirja Kühlewind's Discuss on draft-ietf-ntp-using-nts-for-ntp-24: (with DISCUSS and COMMENT)
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Responses inline.

Kind regards,
Marcus


On 2020-03-24 17:35, Mirja Kuehlewind wrote:
> Given you didn’t define what “treated as an error means” I don’t see a difference. If you received an error you can either abort the connection, or you can e.g. log the error and go on knowing that a certain function might not be available. I don’t see what additional value a warning gives you and most other protocols I know are usually fine with only having errors (and no warning). Without further guidance about what warnings should be used for, I’m afraid this function will not be very useful (and it could be added later in needed). However, this is not a problem and again just a comment, you may or may not consider in the final version.

I agree with you in principle here. We are reluctant to make technical
changes at this late point in the process. Also, it is better to keep
the record in the draft and not need it than to remove it and find out
we need it later.


> So if you only send the ID 0 and don’t set the critical bit, you may just never get a reply…? Not sure if I can imagine a scenario where that is useful but I guess it’s also not a problem.

If you only send ID 0, the setting of the critical bit doesn't really
matter. Provided the request is complete and syntactically correct, the
only difference is what message the server will respond with if it
doesn't support ID 0. Critical bit set will yield a "Unrecognized
Critical Record" Error in return. Critical bit cleared will yield an
empty "NTS Next Protocol Negotiation" in return.


> Not sure what you mean, the MTU should be a function of the path, no? But maybe I lost track here. All I was proposing is to add a reference to some other RFC to provide more information about the actual limits for IPv4.

Ok! Do you know of an RFC with guidance for this? If so, I'd be happy to
include it and I'm sure the other authors wouldn't mind either.