Maintained by: NLnet Labs

cannot resolv a.mx.bsws.de

A. Schulze
Fri Aug 26 14:54:16 CEST 2016


W.C.A. Wijngaards via Unbound-users:

> The domain responds with a DNSSEC-signed NXDOMAIN for mx.bsws.de, and
> thus a.mx.bsws.de cannot exist.  With qname-minimisation unbound then
> stops.
>
> Qname minimisation in unbound assumes that dnssec signed domains will
> do their NXDOMAIN correctly.  (Note the replay possibility on that
> NSEC3 signed domain to its subdomains).  There are also various
> internet drafts (RFCs) in progress that say that nodes under an
> NXDOMAIN node do not exist.
>
> So, these people should fix their implementation.  It is not safe.
> Someone may remove their MX (mail server) addresses, and gain DNSSEC
> validity.  And could do that too with TLSA and claim it was unsecure
> (vis a vis TLSA mailserver security).

thanks for the explanation

> domain-insecure: "bsws.de" and yos.net may be a suitable workaround.
that alone does not help. I now forward the domain to an other, less  
restrictive resolver.

Andreas