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new post: Getting IPv6 working with SmartOS and KVM

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Jan-Erik Rediger 2012-09-16 01:15:11 +02:00
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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