Hello Nick,

> Anything I need to do to allow IPv6... or something?

I agree with Greg here. Have you tried setting the address manually?

ip -6 addr add <ip>/<cidr> dev eth0
ip -6 addr show dev eth0
ip -6 addr del <ip>/<cidr> dev eth0
ip -6 addr show dev eth0

(node-62) [~] ip -6 addr add 2a01:4f8:bb:400::3/64 dev eth0
(node-62) [~] ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2a01:4f8:bb:400::3/64 scope global
       valid_lft forever preferred_lft forever
    inet6 2a01:4f8:bb:400::2/64 scope global
       valid_lft forever preferred_lft forever
    inet6 2a01:4f8:bb:400:225:90ff:fe97:dbb0/64 scope global dynamic
       valid_lft 2591998sec preferred_lft 604798sec
    inet6 fe80::225:90ff:fe97:dbb0/64 scope link
       valid_lft forever preferred_lft forever
(node-62) [~] ip -6 addr del 2a01:4f8:bb:400::3/64 dev eth0
(node-62) [~] ip -6 addr show dev eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2a01:4f8:bb:400::2/64 scope global
       valid_lft forever preferred_lft forever
    inet6 2a01:4f8:bb:400:225:90ff:fe97:dbb0/64 scope global dynamic
       valid_lft 2591990sec preferred_lft 604790sec
    inet6 fe80::225:90ff:fe97:dbb0/64 scope link
       valid_lft forever preferred_lft forever

Do you see a link local address on your eth0? A link local address is one that
starts with fe80:: otherwise try loading the ipv6 module:

        modprobe ipv6 # Don't know if that is the right module name, all my
                      # kernels have ipv6 build in (Debian wheezy / squeeze / 
backports)

Cheers,
        Thomas
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