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(IPv6) DHCP is promoting two global unicast addresses

Hi!

We are trying to setup an IPv6 DHCP-Server on a Cisco 878 (c870-advipservicesk9-mz.124-15.T13.bin). The clients (Windows XP) are getting two global unicast addresses (2x 2001:XXX:668::). Is this normal? We think that one address is published by the DHCP-Server and the other one is from autoconfiguration. Am I right or is there an error in the configuration?

Here is a part of the code:

-------------------------------------------------------------------

!

ip name-server 2001:XXX:XXXX:6::53

!

ipv6 unicast-routing

no ipv6 source-route

ipv6 cef

ipv6 dhcp pool dhcppool

prefix-delegation 2001:XXX:668::/48 0007

dns-server 2001:XXX:XXXX:6::53

dns-server 2001:XXX:XXXX:6:0:153:235:53

domain-name blablabla.com

!

!

interface Loopback0

no ip address

ipv6 address 2001:XXX:668:111::1/128

ipv6 enable

!

interface Vlan20

ip address 10.X.X.1 255.255.255.0

ipv6 address 2001:XXX:668:1::1/64

ipv6 enable

ipv6 dhcp server dhcppool

!

ipv6 local pool dhcppool 2001:XXX:668::/48 50

-------------------------------------------------------------------

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