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).
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Is it that you only have IP phones and the printers that are in the filtered list on that unmanaged switch? If that is the case this should work fine. If you have PCs as well that are controlled by NAC then it will cause the port on the 3550 to go into the unauthenticated VLAN where it will authenticate and then switch to the access VLAN. If you have more than one PC connected then it will cause a MAC Notification to be sent to the NAS causing the port to go into the unauthenticated VLAN once again. Do you have the "remove other out-of-band online users on the switch port when a new user is detected on the same port" enabled? (OOB Management --> Profiles --> Port --> Your switch profile). If you do, uncheck it and try again.
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