Bug#740896: Disable IPv6 autoconf completely from preseed/netcfg

[Jeroen Massar <jeroen@massar.ch>]

Package: netcfg

As one cannot easily update /etc/network/interfaces due to netcfg
overwriting it after late_command (see also #740895)

it would be useful if we can have something akin to:

iface eth0 inet static
        ...
	pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/autoconf
	pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra
	pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_defrtr
	pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_pinfo
	pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra_rtr_pref
        ...

in the preseed.


#740895 =
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=740895


Greets,
 Jeroen