Well, your config isn't proper ifupdown...
The pre-up shouldn't be needed and you shouldn't be using ifconfig to try and
setup extra addresses.
Instead you should be using:
---
iface eth0 inet6 static
address 2001:470:1f1f:2f2f::7
netmask 64
iface eth0:0 inet6 static
address 2001:470:1f1f:2f2f::1
netmask 64
iface eth0:1 inet6 static
address 2001:470:1f1f:2f2f::2
netmask 64
...
---
If you still have the problem even when using the proper ifupdown config
I described above, then please attach a tarball of /var/log/upstart/
** Changed in: ifupdown (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1070893
Title:
not all ipv6 addresses are brought up on boot
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