Hope this helps. http://www.cisco.com/en/US/tech/tk872/technologies_white_paper09186a00801e199d.shtml#wp41640 http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-dhcp.html If I understand your question, you are asking if you can do a one-to-one mapping between a client and an IPv6 address. Are you looking for this mapping to be a global, link local or unique local? What is the driver behind this requirement? If you have the DHCPv6 configured to hand out a /64 prefix then using the manipulation on the MAC address, you will know (predictably) what the address will be: . Here is what Cisco has to say about their implementation of DHCPv6 (from the first link): The Cisco IOS Software DHCPv6 function runs in routers. It is based on RFC3315 DHCPv6 specification. Prefix Delegation [PD] and DNS [DNS] DHCPv6 options are supported and allow distribution of a prefix, as well as a list of DNS servers and domain names. The Cisco IOS Software DHCPv6 client and server are specifically intended as a PD solution and do not implement the entire DHCPv6 protocol. Cisco IOS Software DHCPv6 currently implements PD, the rapid-commit mechanism, stateless DHCPv6 ("DHCPv6-lite"), and the following: • Client Identifier option • Server Identifier option • Option Request option • Preference option • Status Code Option • Rapid Commit option • Identity Association for Prefix Delegation option (IA_PD option) • IA_PD Prefix option • Domain Name Server option • Domain Search List option
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