[Kea-users] dynamic dns hostname conflict

[Thomas Markwalder]

Hello Pawel:


Kea's DDNS process, kea-dhcp-ddns, implements conflict
detection/resolution as described in RFC 4703
(http://www.rfc-archive.org/getrfc.php?rfc=4703).  This behavior
restricts DDNS updates for a given FQDN (hostname), to a single client
as identified by its DHCID.  Therefore,  if  one client creates DNS
entries for a hostname, "example.host.com", and later a different client
attempts to add/replace/delete those entries,  the updates will be
rejected.   The intent is to prevent different clients from owning the
same name.

I did notice that we do not describe this in our administrator's guide
as we should.  I have created a bug ticket to update the documentation
(http://kea.isc.org/ticket/5275#ticket).  We may include a configurable
parameter that turns this policy on and off.   If you this functionality
you would like to see added,  your cause would be aided by opening an
enhancement ticket: http://kea.isc.org/newticket .  This helps us know
what issues are important to our users.

Regards,

Thomas Markwalder
ISC Software Engineering

On 5/1/17 4:46 AM, Paweł Socha wrote:
> Hello everyone,
>
> I am using kea-dhcp4 with kea-ddns service to dynamically allocate new
> addresses for "named" DNS service. When a host with hostname X and IP
> address A  is shut down and new one with hostname X goes up, it gets
> new IP address ( B ), but in dynamic dns is still present previous A-X
> binding, but not B-X. Removal of dynamic entry is rejected with RCODE
> 7 and adding a new one is rejected with RCODE 8. When lease for
> address A is expired, A-X binding is successfully removed.
> Is there any opportunity to solve hostname conflict by overwriting
> Dynamic DNS entries by the newest ones? I've tried everything...
>
> Thanks!
> Pawel
>
>
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