Cirros doesn't have DHCPv6 support

[Daniel Mellado]

Current Cirros image (0.3.4) doesn't have DHCPv6 support, so it would work properly using SLAAC or stateless modes but fail when dealing with IPv6 stateful address configuration [1].

This is affecting the implementation of OpenStack's Tempest scenario tests that would fail in the gate due to lack of support of DHCPv6. As the image has already built-in support for ping6, adding also support for IPv6 in its dhcp client would solve this.

* [1] https://tools.ietf.org/html/rfc3315

[Scott Moser (smoser)]

is this fix-committed in trunk ?

[Daniel Mellado (daniel-mellado)]

Has there been any work done on this topic?

[Scott Moser (smoser)]

Jens points to http://lists.busybox.net/pipermail/busybox/2015-February/082379.html and indicates that busybox's ipv6 dhcp is currently not expected to work , so +CONFIG_UDHCPC6=y isn't really the way to solve this.

thus, we'll apply
 -# BR2_PACKAGE_ODHCP6C is not set
+BR2_PACKAGE_ODHCP6C=y

to all the configs.

i'll do a build with those changes to verify it actually builds and then commit and push a daily build to http://download.cirros-cloud.net/daily/

[ofer blaut (oblaut)]

Hi, What is the status of this fix?

thanks

Ofer

[Scott Moser (smoser)]

At the moment, revno 363 in trunk enables the odhcp6c binary.
I'm not sure what else needs to be done. Input is welcome.

[Luis Rueda (userlerueda)]

I tried many options but not really sure how to use this. Cahnging the /etc/network/interfaces to include:

iface eth0 inet6 auto

throws an error.

[Luis Rueda (userlerueda)]

The error is also shown when placing "iface eth0 inet6 dhcp" in the /etc/network/interfaces

[Dr. Jens Harbott (j-harbott)]

Sadly odhcp6c also failed to acquire an address in my deployments, so I made another switch to dhclient from the ISC DHCP package now and that is working fine for me.

I also added an init script that will run rdisc in order to find out whether dhcpv6 should be used. The patch can be found at lp:~j-rosenboom-j/cirros/dev and it would be great if someone else could test this, too.

[Luis Pigueiras (lpigueiras)]

I tried to acquire an IPv6 with the latest image version of cirros and it doesn't work. odhcp6c seems to fail for me (and also I don't think there is any mechanism AFAIK to use this binary at boot time to get IPv6).

Then I tried to use the cirros image with the @j-harbott patch, and it worked with a small modification (the init script for the IPv6 was failing at boot time, but if you execute it login into the machine, it worked). I needed to add a `sleep(5)` in the init script before executing the `dhclient -6` to make it not fail. Probably I could be hitting this bug: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1447715

[Alona Paz (alonapaz)]

Is there any progress with this bug?
I tried to invoke `usr/sbin/odhcp6c eth0` manually and it doesn't work.
Also when the vm gets RA requesting a stateful address (M and O flags are set) no dhcp solicit message is sent.