2012-01-19: The initial version of this post contained a serious error: Cisco IOS DHCPv6 server does not create host routes; without on-link prefix, the router cannot forward the packets to the attached end-hosts.
IPv6 hosts can use stateless or stateful autoconfiguration. Stateless address autoconfiguration (SLAAC) uses IPv6 prefixes from Router Advertisement (RA) messages; stateful autoconfiguration uses DHCPv6. The routers can use two flags in RA messages to tell the attached end hosts which method to use:
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