[dns-operations] Questions on DNS Flag day 2020 proposal

Peter van Dijk peter.van-dijk at open-xchange.com
Tue Jun 18 14:14:39 UTC 2019

On Tue, 2019-06-18 at 09:28 +1000, Mark Andrews wrote:
> One thing that hasn’t been mentioned so far with respect to TCP
> fallback is populating the additional section with glue and setting
> TC=1 when it doesn’t fit.
> STD13 doesn’t say glue as optional and not being able to fit glue
> into a referral response should result in TC=1 being set.  Named
> does this if the first GLUE RRset doesn’t fit.  It should do this
> if any of the GLUE RRsets don’t fit.  If we are no longer going to
> be pandering to clients that don’t support TCP this is one of the
> things I’d like to fix.
> Lack of glue in referrals has caused DNS resolution failures in the
> past.

Starting with version 4.2.0 (soon to be released), the PowerDNS Auth
will truncate and set TC=1 for -any- additional data that did not fit.

Kind regards,
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

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