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+---
+layout: post
+title: Getting IPv6 working with SmartOS and KVM
+date: 16.09.2012 01:13
+---
+
+Just about 2 weeks ago I started to play around with [SmartOS][].
+
+SmartOS is a fairly recent hypervisor for virtualization, open-sourced by
+[Joyent][], the great guys behind [node.js][nodejs] in August 2011. It's based on [Illumos][], which
+itself is a fork of [Solaris][].
+
+The [wiki][] is a great place to get started as well as the [man page for vmadm][manpage].
+Of course I found more articles and [saved them in my pinboard account][pinboard].
+
+But one thing I did not really get to work was IPv6. After a while I found the
+wiki page for [IPv6 in a zone][ipv6zone] which worked, atleast for SmartOS
+zones.
+
+But I had no luck with my KVM-based Ubuntu machine. I did it the same way,
+using basic tools (`ifconfig/ip`, `/etc/network/interfaces`), but I could not
+even ping the machine itself from within the page.
+
+So I asked in the IRC channel (#smartos on freenode, great and friendly guys ;))
+
+While IPv6-support is still not included in SmartOS tools itself [some patches for this exist][ip6patches].
+This is only for zones and not for KVM instances, but I was told to check `dmesg` and other logs (d'oh! Why didn't I do this before?)
+
+And this is what I found:
+
+    eth0: IPv6 duplicate address detected!
+
+A quick search turned up a [forum post][forumpost] which linked to [this blog post][duplicatefix].
+
+The fix:
+
+    sudo sysctl net.ipv6.conf.eth0.accept_dad=0
+
+Put `net.ipv6.conf.eth0.accept_dad=0` into `/etc/sysctl.conf` to make it persistent.
+
+This disables the Duplicate Address Detection.
+
+After a reboot everything works and the machine works over IPv6.
+
+When I talked to my boss about this he directly knew another related problem and the explanation:
+
+> If you're wondering why a Linux machine won't do v6 anymore when doing a
+> monitor session over a VLAN which also hosts the default network: The machine
+> sees some Neighbor-talking over the VLAN and switches to `dadfailed`
+> effectively breaking the v6.
+
+
+
+[smartos]: http://smartos.org/
+[nodejs]: http://nodejs.org/
+[illumos]: http://illumos.org
+[solaris]: http://en.wikipedia.org/wiki/Solaris
+[joyent]: http://joyent.com/
+[wiki]: http://wiki.smartos.org/
+[manpage]: https://github.com/joyent/smartos-live/blob/master/src/vm/man/vmadm.1m.md
+[pinboard]: https://pinboard.in/u:badboy/t:smartos/
+[ipv6zone]: http://wiki.smartos.org/display/DOC/Setting+up+IPv6+in+a+Zone
+[ip6patches]: https://github.com/joshie/smartos-live/tree/ip6
+[duplicatefix]: http://timesinker.blogspot.de/2009/11/karmic-ipv6-global-address-problems.html
+[forumpost]: http://ubuntuforums.org/showthread.php?t=1410306