Adding root servers as local secondary zone to local caching server

Chriztoffer Hansen ch at
Fri May 21 14:33:57 UTC 2021

On Fri, 21 May 2021 at 15:27, Charles Sharp via Unbound-users
<unbound-users at> wrote:
> > wait a bit for the zone transfers to take place and then have a look
> > at the zones, using such a config your DNS will basically act as a
> > "slave root" DNS that is, will keep a copy of the forward and
> > reverse root zones
> So... will this actually work as it appears, and if so, is it a good idea?
> Also - is it possible to do the same thing in Unbound, and if so, how?

Sure it is possible!

What you are asking is AXFR transfer of the root zone file. A select
number of the root servers support AXFR zone transfer with your local
DNS server setup with a read-only copy (stub node).

Another way to go about it is by downloading the root.hints file from using a local cron job instead of AXFR zone transfer.


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