[Pdns-users] ODP: PDNS Recursor - force IPv6

Thomas Mieslinger miesi at mail.com
Tue Nov 16 11:10:02 UTC 2021

For reasons, I have been unable to debug, my recursive servers
frequently only do IPv4 although IPv6 connected and authoritatives are
also IPv6 connected.

Warming the recursors caches with dig AAAA ns-with-AAAA.example.com let
the recursor learn that the zones are also available over IPv6 with a
better latency.

(I know that this is a hack... but sometimes, you know, a hack is better
than being called from NOC every 2 hours)

(Sometimes IPv4 Servers are under attack while IPv6 works fine... and in
my case recurosor failed to switch/stay with IPv6)



Am 16.11.21 um 10:58 schrieb Marcin Gondek via Pdns-users:
> Hi All,
> Correct, prioritize IPv6, fallback on timeout.
> As far is now not possible now, do we have chance to add it in newer
> version?
> Why this could be needed:
> If case of CGNAT/NAT and so on, some people may have resolver on their
> homes.
> They may have public IPv6 address but IPv4 shared which could be limited
> on nameservers side.
> Thanks,
> --
> Marcin Gondek / Drixter
> http://fido.e-utp.net/
> AS56662
> ------------------------------------------------------------------------
> *Od:* Brian Candler <b.candler at pobox.com>
> *Wysłane:* wtorek, 16 listopada 2021 10:48
> *Do:* Otto Moerbeek <otto at drijf.net>
> *DW:* Marcin Gondek <drixter at e-utp.net>; pdns-users at mailman.powerdns.com
> <pdns-users at mailman.powerdns.com>
> *Temat:* Re: [Pdns-users] PDNS Recursor - force IPv6
> On 16/11/2021 08:57, Otto Moerbeek wrote:
>>> I set "query-local-address=,::" to allow the recursor to use both.
>> I think since 4.5 we do the right thing and**only**  use v6 if you set query-local-address=::
>> But that has the consequence that a lot of (v4 only) nameservers become unreachable.
> Ah yes: sorry I misunderstood the OPs requirement "force usage of
> IPv6".  They wanted something less strong: prioritise IPv6 (if both
> available).
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