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

[Pascal Hambourg <pascal.mail@plouf.fr.eu.org>]

Hello,

Juliusz Chroboczek a écrit :
> > > 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.

Things have changed in "recent" kernels. Since 2.6.21, 
interface-specific parameters in net/ipv6/conf and net/ipv4/conf exist 
as soon as the interface is created, before it is up or an address is added.

From ChangeLog-2.6.21 :
> commit 8030f54499925d073a88c09f30d5d844fb1b3190
> Author: Herbert Xu <herbert@gondor.apana.org.au>
> Date:   Thu Feb 22 01:53:47 2007 +0900
>
>     [IPV4] devinet: Register inetdev earlier.
>
>     This patch allocates inetdev at registration for all devices
>     in line with IPv6.  This allows sysctl configuration on the
>     devices to occur before they're brought up or addresses are
>     added.
>
>     Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
>     Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
>
> commit 45ba9dd2007da23da5ac21179451c3c9fee30a96
> Author: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
> Date:   Thu Feb 15 02:07:27 2007 +0900
>
>     [IPV6] ADDRCONF: Register inet6_dev earlier.
>
>     Allocate inet6_dev earlier to allow users to set up per-interface variables.
>
>     Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>