[Kea-users] DDNS RRset exists prerequisite not satisfied (NXRRSET)

[listy]

Hi guys

I have a zone which is empty, no records.
Kea says:
...
Oct 27 06:25:47 kea-dhcp4[1843462]: INFO 
DHCP4_PACKET_RECEIVED [hwtype=1 52:54:00:74:5b:08], 
cid=[01:52:54:00:74:5b:08], tid=0xb95b04e4: DHCPDISCOVER 
(type 1) received from 0.0.0.0 to 255.255.255.255 on 
interface nm-bridge1031
Oct 27 06:25:47 kea-dhcp4[1843462]: DEBUG 
DHCP4_PACKET_DROP_0011 dropped as sent by the same client 
than a packet being processed by another thread: dropped 
hwaddr=52:54:00:76:2b:79, local_address=255.255.255.255:67, 
remote_address=0.0.0.0:68,
...

I assume this is because the client - Ubuntu boxes - also 
want to do DDNS itself?

ISC Bind says:
...
Oct 27 06:25:47 named[74707]: client @0x7f2b48005ed8 
10.2.1.100#39247/key dhcpd: updating zone 'private.road/IN': 
update unsuccessful: ies.private.road/DHCID: 'RRset exists 
(value dependent)' prerequisite not satisfied (NXRRSET)
Oct 27 06:25:47 named[74707]: client @0x7f2b8800e2a8 
10.2.1.100#46050/key dhcpd: updating zone 'private.road/IN': 
update unsuccessful: ies.private.road/DHCID: 'RRset exists 
(value dependent)' prerequisite not satisfied (NXRRSET)
...

Again, those records are absent from the zone, also from 
reverse zone.

If the clients are the culprit - can Kea "take" over here? 
Or clients must be made to not do whatever they are trying 
to do?
Or perhaps, the issue is completely elsewehre?

many thanks, L