intermittent SERVFAIL for high visible domains such as *.google.com

[Brian J. Murrell]

On Tue, 2018-01-23 at 13:38 +0100, Reindl Harald wrote:
> 
> pretty sure it's possible and likely not much different than the 
> unbound-sample below which asks a rbldnsd on port 1043 on the same
> machine
> 
> stub-zone:
>   name: "zone-name."
>   stub-addr: 127.0.0.1 at 1053

This all falls apart because you cannot instruct the ISC DHCP server to
send DDNS updates to a non-standard (!53) port.  :-(

I seem to have no choice but to run the isolated server on a different
IP address and then have to start managing the listen-on directive in
the main server to list all addresses other than the isolated server's
address.  :-(

Cheers,
b.
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