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Help configuring 867-VAE for IPv6 ISP

I have an 867-VAE on a VDSL line currently configured and working for IPv4. Below is the current config for the Dialer1 interface

 

interface Dialer1
description PPPoE DSL dialler for VDSL line
mtu 1492
ip address negotiated
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly in
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer idle-timeout 0
dialer-group 1
keepalive 30
ppp authentication chap callin
ppp chap hostname ME@ISP
ppp chap password 0 xxx
ppp ipcp address accept
no cdp enable

 Im just starting to experiment with IPv6 and have discovered my ISP offers a /56 prefix delegated address using DHCP for IPv6 and I am trying to configure the router to obtain one dual stack with the IPv4.

 

I added the following lines to the Dialer1 config but having done a shut/no shut on it its not getting an IPv6 address.

 

 ipv6 address dhcp
ipv6 enable

I also put ipv6 unicast-routing in the global config

 

Can someone please help me figure out what I;ve omitted/done wrong. The Dialer1 interface has a link local address but not a global unicast.

 

Thanks

 

 

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