Package: ifupdown Version: 0.8.41 Severity: wishlist Issue ===== Using "ip token", a command to specify a fixed Interface ID for IPv6 addressing, is not yet abstracted by ifupdown. A common use case are dynamic-prefix environments in which a fixed interface ID is wanted, e.g. for firewall openings of home routers etc.
Using "ip token" manually requires several non-obvious "hacks" in /etc/network/interfaces. Functional Workaround ===================== Using the following interface config: auto eth0 iface eth0 inet dhcp iface eth0 inet6 manual pre-up ip token set ::192.168.1.35 dev eth0 post-up IF_ADDRESS=:: IF_NETMASK=0 /lib/ifupdown/settle-dad.sh yields a functional setup. This takes care of two things: - Setting the "ip token" before the interface is first taken up. This is required to disable other addressing, such as EUI-64. - Ensuring DAD is settled for all dynamic addresses on the interface, e.g. global addresses and ULAs, so IPv6 is fully up before other services start. Proposed solution ================= I initially considered something like: auto eth0 iface eth0 inet dhcp iface eth0 inet6 manual token ::192.168.1.35 to be a good solution, see also this report for bridge-utils (since my actual case is with a bridge, which has the additional problem that the bridge's pre-up is not accessible): https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059332 However, since settling DAD is also required, potentially this would be easier / more straightforward, i.e. using "token" instead of "manual" as scheme? auto eth0 iface eth0 inet dhcp iface eth0 inet6 token token ::192.168.1.35
