With Debian it is relative easy to setup ipv6 using aiccu.

This can be done using the following steps (assuming you already have an account at www.sixxs.net):

  1. install aiccu

    sudo apt-get install aiccu

  2. edit de /etc/network/interfaces add the following entries:

    auto sixxs
iface sixxs inet6 manual
up ip link set mtu 1480 dev $IFACE
pre-up invoke-rc.d aiccu start
post-down invoke-rc.d aiccu stop

  3. disable the automatic start of aiccu

    sudo update-rc.d aiccu disable

  4. bring the interface up using the command

    sudo ifup sixxs