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[Ntp] Antw: [EXT] Re: NTPv5: big picture

Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de> Mon, 04 January 2021 14:14 UTC

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Date: Mon, 04 Jan 2021 15:14:33 +0100
From: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
To: Hal Murray <hmurray@megapathdsl.net>, magnus@rubidium.se
Cc: "ntp@ietf.org" <ntp@ietf.org>
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Subject: [Ntp] Antw: [EXT] Re: NTPv5: big picture
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>>> Magnus Danielson <magnus@rubidium.se> schrieb am 01.01.2021 um 13:29 in
Nachricht <e7d72afa-7cff-3158-f930-81d3510100a0@rubidium.se>:

...
> 
> When on the "Internet", we should require DNS access. We should require

At least (regarding IPv6 addresses) being able to resolve a host name to an
address.
An interesing point is whether that's part of the protocol, because on-wire we
do not have host names, do we?

> boxes that have preconfigured servers to have them preconfigured as
> DNS‑entries rather than fixed IP addresses. We learned that the hard way
> (ask PHK). This is not to say it will be the right thing for all other
> scenarios we can use NTP in.

I also prefer DNS names, for documentation reasons.

When demanding DNS use, it will be interesting to specify _when_ DNS is being
used: Obviously not for each packet, but preferrably more than once in the
lifetime of the daemon.

> 
> Cheers,
> Magnus
> 
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