> Hello,
> I have only one nameserver for a domain.
> Can I set the second nameserver for this domain to a public dns cache?
> for example:
> abc.com.  IN  NS  ns1.abc.com.
> abc.com.  IN  NS  ns2.abc.com.
> ns2.abc.com.  IN  A  8.8.8.8  # 8.8.8.8 is google's public dns server

No. Don't do that. A cache/resolver is not the same as an authoritative
server. For example, it will not flag the cache contents as being
authoritative (the AA flag).

Get a proper secondary/slave nameserver somewhere, it doesn't need to be
costly.

Regards
Eivind Olsen
eiv...@aminor.no


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