Re: IPv6 logging noise

Marco Moock <[email protected]> Fri, 21 Nov 2025 03:20:06 +0100

Newsgroups	gmane.network.dns.bind9.user
Message-ID	<20251121032006.278d3343__30494.6329606295$1763691652$gmane$org@ryz.dorfdsl.de>

Am 20.11.2025 um 17:15:53 Uhr schrieb Doug Freed:

> On 11/20/25 13:00, Marco Moock wrote:
> > On 20.11.2025 10:07 Philip Prindeville via bind-users
> > <[email protected]> wrote:
> >   
> >> I’m on a US residential ISP, and they don’t support IPv6.  As a
> >> result, I’ve disabled it locally as well with `options {
> >> listen-on-ipv6 { none; }; };`.  Well, there are more options than
> >> that, but that’s the relevant one.  
> > 
> > Disabling IPv6 is not necessary in normal circumstances.
> > 
> > Please let us know why you do it.  
> 
> This is incorrect.  It is frequently necessary to disable IPv6
> upstream queries in named in situations where IPv6 is either entirely
> unavailable or is unusable.  As an example, a VM in my lab has an
> IPv6 Unique Local Address, but no default gateway, and has no IPv6
> connectivity outside of the VLAN it's in.  Without disabling IPv6 in
> named, it still makes attempts to query IPv6 authoritative
> nameservers (the below log line came from that VM).  This can be a
> problem because those queries still count toward various query limits
> even though they've failed.

Ok, that is weird. Is there a route to the destination of the
authoritative server?

If so, the connection will be attempted. If not, the connection must
not be attempted and seems to be an issue.

-- 
Gruß
Marco

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