Problem description: a MS Windows (7,8,8.1,10) client doesn't get an IPv6 address when it connects to the network

The client must send a DHCPv6 request with a DUID that contains the MAC address of the requesting interface. The MAC address must be registered in LANDB (Network database) in order to be allowed to get an address.

Possible workrounds:

Problem description: a CERN MS Windows device prefers IPv4 connectivity, even when IPv6 is availble and working

Solution: Remove the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TCPIP6\Parameters\DisabledComponents and reboot. ipv6 will be preferred when available.