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

[Otto Moerbeek]

On Tue, Nov 16, 2021 at 12:10:02PM +0100, Thomas Mieslinger via Pdns-users wrote:

> 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)

That is a known thing. Currently, if v4 nameserver addresses are in
the cache, the recursor won't do an active lookup for v6 addresses.

I plan to fix this some day.

https://github.com/PowerDNS/pdns/issues/7542

	-Otto

> 
> Cheers
> 
> Thomas
> 
> 
> 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=0.0.0.0,::" 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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> > 
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