Yeah, know that you can set it for each client (Linux/Windows/macOS). My 
problem is many mobile clients (iOS) where setting this up is impossible. And 
Netflix / Amazon / whatever becomes an issue... so network-wide solution would 
be cool!

Sent from my iPhone

> On 12 Feb 2018, at 11:48, Brian Candler <> wrote:
>> On 12/02/2018 10:32, Radoslaw Kamil Ejsmont wrote:
>> My goal is to successfully resolve AAAA only for hosts that are IPv6 only 
>> and serve A only to dual-stack hosts.
> I can't answer your question about doing this inside PDNS, but just wanted to 
> mention that you can configure individual hosts to prefer IPv4 over IPv6 when 
> both are available.
> In Linux this is done by configuring /etc/gai.conf, e.g. for Ubuntu just 
> uncomment this line:
> precedence ::ffff:0:0/96  100
> I don't really do Windows, but I understand the corresponding feature is 
> called "prefix policies":
> Regards,
> Brian.

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