I am not aware of a DHCPv6 server that does this.  I believe that the expectation and design for IPv6 is that the host is responsible for this (per RFC 4862).    This document specifies the steps a host takes in deciding how to    autoconfigure its interfaces in IP version 6.  The autoconfiguration    process includes generating a link-local address, generating global    addresses via stateless address autoconfiguration, and the Duplicate    Address Detection procedure to verify the uniqueness of the addresses    on a link. I hope that helps.  To be clear, I am speaking of link-local addresses.  Global addresses are a different matter when mapped to a DNS name.  I would expect that any FQDN name would resolve to a static IPv6 address (or by some DDNS means). ... View more

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 ... View more

Did you add this client to the Exemption, or to the filtered list?  I have seen this happen in my own environment when I mistakenly added the MAC to the "Exempt Device" list instead of the "Filters" list.  Hope this helps. ... View more

There is a site (http://www.linuxquestions.org/questions/linux-software-2/cisco-vpn-client-353630/) that may have the answer that you need. Here are the steps that may apply to your issue.... 5. Do a uname -r to find the correct kernel-headers for your build. 6. Use synaptic to search and install the correct kernel-HEADERS, not source. 7. Untar your Cisco Client, go to the vpnclient folder and do a sudo sh vpn_install 8. Answer all questions, the defaults worked for me. 9. make sure you start the vpn sub-system with sudo /etc/init.d/vpnclient_init start 10. Copy your .pcf profile to the sudo cp /etc/opt/cisco-vpnclient/Profiles. 11. Do a vpnclient connect (without the .pcf extention) Hope this helps. ... View more