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IPv6, RADIUS and PPP Sessions.

I have two questions here if anybody can through some light on this.

Q1) How do I assign a dynamic IPv6 address to a PPP Session via RADIUS. Only way I could get the IPv6 address assigned to the client is via a local IPv6 Prefix pool on the Access Server. Using local pools is impossible to manage if the remote devices are managed CPE's.

Q2) When I have a PPP session attached to my access server using IPv6, when I issue the "show users" command, I can see that the user is attached to a virtual access interface but the IPv6 address is not displayed as it does when using IPv4.

Any ideas

Thanks in advance.