DAD/tentative addresses vs system boot with network links down

[George Bonser]

> If one
> - configures a static IPv6 address on some interface with normal
>   (giving "ip address add ADDRESS dev DEV") config mechanisms
> - uses this address in daemon configurations as "bind address"
> - boots the system with link of DEV down
> ... those daemons will fail to start.
> 
> The reason is, that an address is in state "tentative" until
> duplicate address detection can be completed - which is
> (per definition?) not possible on an unavailable link.
> 
 
Well, setting a sysctl for the interface might do it:

/etc/sysctl.conf

net.ipv6.conf.DEV.dad_transmits = 0

So you basically turn off DAD for the interface.