[Kea-users] DDNS limitations - ddns-qualifying-suffix vs domain-name

[Darren Ankney]

Hi Vladimir,

You can set it "ddns-qualifying-suffix": "", which resets it to empty
in the block in which you do that.  You could also only specify inside
subnets where you need it specified and not specify at global level.
There would have to be some way to flag hostnames that you wanted to
ignore a ddns-qualifying-suffix setting somehow to have it
simultaneously set to some value and not apply to all hostnames in
that block.

Thank you,

Darren Ankney

On Tue, Oct 17, 2023 at 2:50 AM Vladimir Nikolić <vladimir at nikolic.si> wrote:
>
> Thanks Darren.
>
> If ‘ddns-qualifying-subnet’ is being set on any level, it’s then appended to the ‘hostname’ value from the host reservation. ‘hostname’ is the FQDN, only if ‘ddns-qualifying-subnet’ is empty.
> So it’s either one or another.
> Which is really inflexible.
>
> Regards
>
>
> > On 17 Oct 2023, at 12:26 am, Darren Ankney <darren.ankney at gmail.com> wrote:
> >
> > Hi Vladimir,
> >
> > The DHCPv4 domain-name option (15) isn't meant for use with ddns.  It
> > is a search domain that the client should use when performing name
> > resolution.  See: https://www.rfc-editor.org/rfc/rfc2132#section-3.17
> >
> > You can set ddns-qualifying-suffix at the global, shared-network and
> > subnet level.  In a host reservation, you can use the "hostname"
> > parameter to specify a FQDN to send to the client and for use in DDNS.
> > See here: https://kea.readthedocs.io/en/kea-2.4.0/arm/dhcp4-srv.html#reserving-a-hostname
> >
> >> On Mon, Oct 16, 2023 at 3:23 PM Vladimir Nikolic via Kea-users
> >> <kea-users at lists.isc.org> wrote:
> >>
> >> Hi,
> >>
> >> While trying to migrate DHCP service from ISC DHCP to ISC KEA, we are
> >> hitting following KEA limitations:
> >>
> >> - option domain-name has no part in DDNS names construction, it's only
> >> ddns-qualifying-suffix that's being honoured
> >> - ddns-qualifying-suffix can't be specified in the class definition (we
> >> have dedicated zone for our OOB devices)
> >> - there can be only one DDNS zone for all the clients in a subnet
> >> (ddns-qualifying-suffix), with ISC DHCP you can have one default
> >> domain-name for a subnet and every single host reservation with a
> >> different domain-name (DDNS zone)
> >>
> >> Regards,
> >> Vladimir
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