Hello Dominik,

> iface eth0 inet6 static
>       address 2001:stuff::2
>       netmask 64
>       gateway 2001:stuff::z
>       accept_ra 1
>       autoconf 1
>       privext 2
>       up ip addr add fd9f:stuff::z/64 dev eth0
> 
> After booting, the host successfully got its various IPv6 addresses, but
> the additional ULA address is missing. Executing the ip addr add
> command manually in the shell works without problems.

The post-up lines are executed for static ipv6 interfaces, but not if
something went wrong while configuring the interface. One issue is that
ifupdown assumes the kernel is performing Duplicate Address Detection in
a timely fashion, and only considers the interface properly up if the
kernel completes DAD. It could be that at boot time this doesn't work.
Try adding "dad-attempts 0" to the iface eth0 stanza, and see if that
makes a difference.

-- 
Med vänlig hälsning / with kind regards,
Guus Sliepen <guus.slie...@astro.su.se>


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