This seems to work for me
$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
iface eth0 inet6 dhcp
up sysctl net.ipv6.conf.$IFACE.accept_ra=1
up rdisc6 $IFACE
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https://bugs.launchpad.net/bugs/1013597
Title:
No default route for stateful DHCPv6
Status in ifupdown package in Ubuntu:
Fix Released
Status in ifupdown source package in Precise:
Triaged
Bug description:
The default route cannot be provided via DHCPv6, it must be obtained
from router advertisements. However, when using the dhcp method for
inet6 in /etc/network/interfaces (e.g. "iface eth0 inet6 dhcp"), ifup
will set net.ipv6.conf.<IFACE>.accept_ra=0, resulting in no default
route for IPv6. Instead, it should explicitly set accept_ra=1.
A workaround is to set it in a post-up script. However, Linux
apparently only sends router solicitations when the interface is
brought up, so if unsolicited RA:s are infrequent the host will be
without a default route until the next RA.
Another problem is that when bringing the interface down on dual-stack
hosts, there will be a long timeout. This is because bringing down
IPv4 also brings the interface link down, and afterwards dhclient
cannot release the DHCPv6 lease due to the link being down ("RTNETLINK
answers: Cannot assign requested address"). The workaround is to bring
the link back up before bringing IPv6 down.
So the workarounds (which obviously should not be needed) for a dual-
stack dhcp client look like this:
iface eth0 inet dhcp
iface eth0 inet6 dhcp
up sysctl net.ipv6.conf.$IFACE.accept_ra=1
pre-down ip link set dev $IFACE up
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