On 11/7/2020 10:15 AM, Reindl Harald wrote:
>
> https://tools.ietf.org/html/rfc1537
> Common DNS Data File Configuration Errors
>
> 6. Missing secondary servers
>
> > It is required that there be a least 2 nameservers
> > for a domain.
>
> -----------------------------
>
> that above is common knowledge virtually forever and the difference of
> "must" and "should" in IETF wordings is also very clear 

While I agree this is common knowledge as a best practice, this rfc is a
memo NOT a standard from my reading:

  This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is
   unlimited.

Regards,
KAM

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