Re: defining static IPv6 addresses in /etc/network/interfaces

[Juliusz Chroboczek <Juliusz.Chroboczek@pps.jussieu.fr>]

>> iface eth0 inet static
>>   pre-up  sysctl -w net.ipv6.conf.eth0.autoconf=0 > /dev/null || true

> Whether it all works as expected will be seen after the next reboot.

Unless something has changed in recent kernels, it won't.  There's no
conf/eth0 knob before the interface is up.

You'll need to arrange to run

  sysctl -w net.ipv6.conf.eth0.autoconf=0
  ip -6 addr flush dev eth0 to 2000::/3

after the interface is upped, but before it is configured.  On nodes that
do VLANs, it's even worse, you need to do something like

  ip -6 addr flush dev eth0
  ip -6 addr flush dev eth0.0 to 2000::/3
  ip -6 addr flush dev eth0.1 to 2000::/3

                                        Juliusz