[dns-operations] CNAME as NS-RRdata

[Florian Weimer]

* Lutz Donnerhacke:

> Is there a way to tell them, what's wrong?
> They got an email yesterday, nothing happened.

It seems that they have replaced the CNAME RRs with proper A RRs.  In
this case, it's a bad choice because ns4.checkpoint.com returns
NXDOMAIN for (almost?) everything.  Previously, this wasn't a problem
because most resolvers refuse to resolve through that CNAME.  Now
they've got real reachability issues with domains such as
zonealarm.fr. 8-(