Re: Quic: the elephant in the room

Nico Williams <nico@cryptonector.com> Mon, 12 April 2021 15:54 UTC

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Date: Mon, 12 Apr 2021 10:54:04 -0500
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From: Nico Williams <nico@cryptonector.com>
To: "Salz, Rich" <rsalz@akamai.com>
Cc: IETF Discussion Mailing List <ietf@ietf.org>
Subject: Re: Quic: the elephant in the room
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On Mon, Apr 12, 2021 at 12:54:20PM +0000, Salz, Rich wrote:
>     > Thanks for the explanation.  I don't know enough DNSSEC to know if
>     > that's actually deployable, but okay
> 
> >    You can tune down TTLs before the change, etc.
> 
> The TTL is already a small number of seconds so that in the standard
> DNS case, they can switch within five seconds.
> 
> Sounds to me that, as I thought, they will have to sign a TLSA record
> every five seconds.  No?

No.  TTL != notAfter.

You do not have to re-sign any RRs every N seconds just because their
TTL is N seconds.