That will get IPv6 up and running on your network with autoconfiguration ie the router advertises the prefixes and the IPv6 Client auto configures its host address utilizing it's mac address. If you want to supply DHCPv6 via your own DHCP server eg Windows 2012 DHCP server, you would untick "stateless" and then go to stateful. The UTM is also capable of issuing DHCPv6
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