QNAME minimisation question

[Greg Choules]

The help text for delv says you can specify a source using -b, the same as
you can with dig:

Usage:  delv [@server] {q-opt} {d-opt} [domain] [q-type] [q-class]
Where:  domain  is in the Domain Name System
        q-class  is one of (in,hs,ch,...) [default: in]
        q-type   is one of (a,any,mx,ns,soa,hinfo,axfr,txt,...) [default:a]
        q-opt    is one of:
                 -4                  (use IPv4 query transport only)
                 -6                  (use IPv6 query transport only)
                 -a anchor-file      (specify root trust anchor)
                 -b address[#port]   (bind to source address/port)
etc...

The rest I don't know, yet.
Hope that helps, Greg

On Wed, 4 Jun 2025 at 07:46, Nick Tait via bind-users <
bind-users at lists.isc.org> wrote:

> Hi Stace.
>
> The transport protocol used to ask the question is (or should be)
> independent of the question being asked. So in this case asking for a
> PTR record for an IPv6 address wouldn't change whether IPv4 or IPv6 is
> used to make the recursive queries.
>
> I've done a bit more testing on this, and it seems like if you use the
> +ns option, delv ignores the -4, -6 and -b options. I'm not sure if that
> is by design or not, but it would be useful to be able to control which
> source IP address delv uses for queries and whether delv queries for A
> or AAAA records? (It would also be good if it queried for both by
> default -- i.e. if neither -4 or -6 were specified?)
>
> Can anyone advise whether this something I should raise a bug report for?
>
> Nick.
>
> P.S. Using +ns also causes delv to ignore a server specified with the @
> option, and in this case it logs a message like: ";; WARNING: using
> internal name server mode: '@8.8.8.8' will be ignored"
>
> On 03/06/2025 22:36, Stacey Marshall wrote:
> > On 3 Jun 2025, at 10:29, Nick Tait via bind-users wrote:
> >
> >> But I also noticed that delv only makes A queries (not AAAA), and even
> if I specify "-6" on the command-line it makes no difference?
> > Have yo tried using an IPv6 address with the -x option?
> >
> >
> > delv -x ::ffff:45.90.5.195 +ns +qmin +maxqueries=100
> >
> >
> > --
> > Stace
> --
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