Hello, I'm working on the relationship between IPv6 and DynamicDNS on several OS. I've succeeded in making my testbed with an automatic registration into the DNS at the startup of computers. Then IPv4 and v6 addresses are well recorded inside the DNS. But the fact is that I still have the IPv4 network. Next I tried to put off the IPv4 protocol from the network and get an only IPv6 network. * For the linux machines -> no problems * For the windows 2003 machines -> they are no more recorded inside the DNS table Thus I have few questions about this thema : - Is there anything special to setup in the OS to allow dynamic updates over IPv6 ? may be in the netsh tool ? I've searched myself and haven't found ... - Is IPv4 necessary to carry the register messages that serves for the dynamic DNS updates ? It would mean that IPv6 is not autonomous on the new windows OS ? strange ... - Is there an equivalent of the command ipconfig /registerdns ... that exists when IPv4 is shut down ? Regards - Thomas