Re: [Ntp] I-D Action: draft-ietf-ntp-using-nts-for-ntp-18.txt

Watson Ladd <watson@cloudflare.com> Wed, 01 May 2019 17:33 UTC

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From: Watson Ladd <watson@cloudflare.com>
Date: Wed, 1 May 2019 10:33:20 -0700
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To: Marcus Dansarie <marcus@dansarie.se>
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Subject: Re: [Ntp] I-D Action: draft-ietf-ntp-using-nts-for-ntp-18.txt
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On Wed, May 1, 2019 at 2:29 AM Marcus Dansarie <marcus@dansarie.se> wrote:
>
> On 2019-05-01 02:02, Watson Ladd wrote:
> > I do not read 5.7 as encouraging using multiple cookie placeholder
> > fields to send a single cookie back. I actually misread the
> > specification and thought it required the cookie extension to be
> > longer then the cookie sent in response. Perhaps this should be
> > rewarded to encourage the server to send the minimum of {1+cookies
> > requested, 1+number of cookies that fit in total length of cookie
> > placeholder fields}.
>
> You are right in not reading 5.7 that way. There's no wording in there
> suggesting that. What I described was a way that a client implementation
> could resolve the situation.
>
> What 5.7 currently says about this is "The number of NTS Cookie
> extension fields included SHOULD be equal to, and MUST NOT exceed, one
> plus the number of valid NTS Cookie Placeholder extension fields
> included in the request." I think this, in essence, is saying the same
> thing as what you suggest.

It certainly permits it, but it doesn't say you should include as many
cookies as you can without inflating the size. Maybe it should?
>
> Kind regards,
> Marcus
>
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