Debian : configuration dual-stack IPv4 / IPv6

root@skinner:~# more /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
    address 10.0.0.11
    netmask 255.0.0.0
    network 10.0.0.0
    broadcast 10.255.255.255
    gateway 10.0.0.1
    up ip -6 addr add fdfe:cd5e:234c:8277::8/64 dev eth0
    up ip -6 route add default via fdfe:cd5e:234c:8277::1
    down ip -6 addr del fdfe:cd5e:234c:8277::8/64 dev eth0
    down ip -6 route del default via fdfe:cd5e:234c:8277::1