[Pdns-users] SERVFAIL responses on malformed subdomain query

Peter van Dijk peter.van.dijk at powerdns.com
Thu Oct 14 14:36:17 UTC 2021

On Thu, 2021-10-14 at 16:01 +0200, Remi Gacogne via Pdns-users wrote:
> On 10/14/21 15:52, Thib D via Pdns-users wrote:
> > It seems like pdns auth servers are answering SERVFAIL queries when the 
> > subdomain is malformed in the query. It is testable on powerdns.com 
> > <http://powerdns.com> domain - which I assume is hosted on a pdns-auth 
> > backend.
> > 
> That behaviour can be configured via the 8bit-dns parameter [1], which 
> default to false. It used to be an issue for some PowerDNS backends but 
> my understanding is that it should be safe to turn it on nowadays.
> [1]: https://doc.powerdns.com/authoritative/settings.html#bit-dns

I am not sure it is safe to turn on with the SQL backends today. Our
test suite does not cover it, so we can't guarantee correct operation.

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

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