Hello,
This happens because ISC-DHCP does not follow RFC 4361 yet. The v4
client sends an identifier (client-identifier), le v6 client sends a
different identifier (DUID).
DDNS uses conflict detection to prevent a client with the same name to
replace a record already there. This conflict detection is base on a
signature of the identifier provided by the client.
Different identifiers => different signatures => conflict between v4 and
v6 clients.
To make it work, v4 clients should send the same DUID as the v6 client :
http://www.ietf.org/rfc/rfc4361.txt
This should be fixed in ISC-DHCP 4.3 :
https://deepthought.isc.org/getAttach/86/AA-00974/webinar-ISC+Product+RoadmapOct2013.pdf
(slide #21)
http://www.youtube.com/watch?v=16Qkr2o1IdU
Nicolas
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